{"title":"Butyl Tape","description":"\u003cp\u003eSouth Mountain Supply carries professional-grade butyl tape for auto glass installation and sealing. Butyl tape provides a flexible, waterproof seal around windshields, backlites, and side glass, preventing leaks and rattles. Shop rolls and pre-cut strips trusted by glass installation professionals across North America since 1992.\u003c\/p\u003e","products":[{"product_id":"foam-core-butyl-individually-boxed","title":"Marcy Foam-Core Butyl Tape — 6mm × 12ft | Individually Boxed | ME612C","description":"\u003cp\u003e✅ \u003cstrong\u003eIn Stock\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMarcy ME612C foam-core butyl tape in a single-application box — the correct butyl for windshield installation where foam-core is required. The foam center delivers compression deflection and rebound that solid butyl cannot match, creating a leak-proof seal even when the glass settles unevenly during cure. The 6mm profile is the standard width for most passenger car and light truck windshield applications. Many Ford, Lincoln, and Mercury OE installation procedures specifically require foam-core butyl — ME612C is the go-to product for those platforms. Individually boxed and ready to use on the job.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e ME612C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 6mm × 12ft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Type:\u003c\/strong\u003e Foam-core\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Individually boxed (single-application)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Windshield and fixed-glass installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplication\u003c\/h2\u003e\n\u003cp\u003eApply to the pinch weld or vehicle channel before setting the glass. Designed for windshield and urethane-bonded fixed-glass installations where foam-core butyl is required by OEM or quality-standard procedures. Not intended for mechanically-fastened glass — use solid-core butyl (ME615S, ME815S, ME915S) for those applications.\u003c\/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is foam-core butyl and why is it different from solid-core?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eFoam-core butyl has a cellular foam center wrapped in butyl. The foam compresses as the glass is set and rebounds to fill gaps and voids, creating a conforming, leak-free seal. Solid-core butyl seals well but doesn't have the same rebound. Ford, Lincoln, Mercury OE procedures and many professional installation quality standards require foam-core because of this superior void-filling and leak-resistance characteristic.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhich vehicles require foam-core butyl by OEM spec?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eMany Ford, Lincoln, and Mercury vehicles specifically call out foam-core butyl in their OEM windshield installation procedures. When servicing a Ford platform, default to foam-core. For other makes, refer to the vehicle-specific procedure — both foam-core and solid-core are used industry-wide, and using the wrong type can affect seal quality.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhen should I use 6mm vs. 8mm foam-core butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eThe 6mm profile (ME612C) suits the majority of standard passenger cars and light trucks with typical pinch weld channel dimensions. The 8mm profile (ME810B) is used when a wider bead is specified or when the channel is larger than standard. Match the profile to the OEM procedure or pinch weld dimension — 6mm is the most common choice across most vehicle platforms.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eDoes foam-core butyl work in cold weather?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. Marcy foam-core butyl remains workable across a wide temperature range. In temperatures below 40°F, warm the tape slightly before application to improve conformability and adhesion to the pinch weld. Avoid overheating — excessive heat will deform the foam core before the glass is set.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhy is individually boxed butyl useful for mobile installers?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eThe Butyl-in-a-Box format keeps the tape clean and protected from dust, UV, and contamination until needed. For mobile installers working from a van or truck, it eliminates the handling issues of unwrapped bulk rolls and simplifies per-job material tracking. Each box contains a single-application length — open, use, done.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Marcy","offers":[{"title":"Default Title","offer_id":44338511184087,"sku":"ME612C","price":7.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0499\/4262\/6461\/files\/butyl_page_img.jpg?v=1702924533"},{"product_id":"copy-of-foam-core-butyl-individually-boxed","title":"Marcy Solid-Core Butyl Tape — 1\/4\" × 10ft | Individually Boxed | ME625","description":"\u003cp\u003e✅ \u003cstrong\u003eIn Stock\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMarcy ME625 solid-core butyl tape in a single-application box — the all-purpose butyl for sealing mechanically-fastened side and back glass, re-adhering door vapor barriers, and everyday automotive sealing tasks. The 1\/4\" round profile is the most common solid butyl diameter in the auto glass trade, handling the majority of channel widths and gap sizes. Works reliably in hot and cold weather. Individually boxed for the mobile installer — no cutting, no re-wrapping. \u003cstrong\u003eNot intended for windshield installation — use foam-core butyl (ME612C or ME810B) for windshield applications.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e ME625\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\" (6.4mm) round × 10ft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Type:\u003c\/strong\u003e Solid-core\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Individually boxed (single-application)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mechanically-fastened side and back glass, door vapor barriers, general automotive sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplication\u003c\/h2\u003e\n\u003cp\u003eApply along the glass channel or frame opening before pressing the glass into position. For mechanically-fastened side, rear, and quarter glass on trucks, vans, and SUVs, and for door vapor barrier re-adhesion and general body sealing tasks. Do not use for urethane windshield installations — use foam-core butyl for those.\u003c\/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is solid-core butyl used for?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core butyl is the correct sealant for mechanically-fastened glass — side windows, vent glass, sliding rear windows, and quarter glass on trucks and SUVs where fasteners (not urethane) hold the glass in position. It is also commonly used for re-adhering door poly vapor barriers and for general body sealing where a flexible, weather-resistant bead is needed. It is not the correct product for urethane-bonded windshield installation — use foam-core butyl for those applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the difference between solid-core and foam-core butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core butyl is an all-butyl bead. It conforms to the channel and seals effectively, but does not have the rebound compression of foam-core. Foam-core is designed specifically for windshield installation, where the glass settles during cure and voids must be filled by the foam rebound. For mechanically-fastened glass where fasteners control position, solid-core is the correct and more economical choice.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhen should I use 1\/4\" vs. 5\/16\" vs. 3\/8\" solid butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eThe three profiles correspond to different gap sizes. The 1\/4\" (ME625\/ME615S) handles the majority of standard applications and is the most commonly used diameter. Use 5\/16\" (ME825\/ME815S) or 3\/8\" (ME925\/ME915S) when the channel or gap is wider and a fuller bead is needed to seal properly. Too small leaves voids; too large makes glass positioning difficult.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eDoes solid butyl work in both hot and cold weather?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYes — Marcy solid butyl is formulated for all-weather use. In cold temperatures it stiffens but remains workable — warming slightly in your hands or with low heat improves conformability. In hot weather it becomes softer and more pliable, which can ease application but requires care not to stretch or distort the bead during placement.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eShould I use boxed or bulk solid butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eIndividually boxed (ME625, ME825, ME925) is ideal for mobile installers — each box is a clean, single-application length ready to use on the job. Bulk packs (ME615S, ME815S, ME915S) provide a longer roll at a lower cost per foot, making them better value for shops doing high-volume work where material efficiency matters more than per-job convenience.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Marcy","offers":[{"title":"Default Title","offer_id":44338521309399,"sku":"ME625","price":8.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0499\/4262\/6461\/files\/41uMd0QNYJL._SL1200.jpg?v=1705087874"},{"product_id":"foam-core-butyl-8mm-x-10-individually-boxed","title":"Marcy Foam-Core Butyl Tape — 8mm × 10ft | Individually Boxed | ME810B","description":"\u003cp\u003e✅ \u003cstrong\u003eIn Stock\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMarcy ME810B foam-core butyl tape in a single-application box — the wider 8mm profile for windshield and fixed-glass installations requiring a larger bead. The foam center delivers compression deflection and rebound that solid butyl cannot match, creating a leak-proof seal even when the glass settles unevenly during cure. Ideal for vehicles with wider pinch weld channels, sunroofs, backsliders, and custom van or RV windows where a fuller butyl profile is needed. Many Ford, Lincoln, and Mercury OE installation procedures require foam-core butyl — ME810B covers those platforms when 8mm is specified. Individually boxed and ready to use on the job.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e ME810B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 8mm × 10ft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Type:\u003c\/strong\u003e Foam-core\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Individually boxed (single-application)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Windshield, sunroof, backslider, and fixed-glass installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplication\u003c\/h2\u003e\n\u003cp\u003eApply to the pinch weld or vehicle channel before setting the glass. The 8mm profile is used when a wider channel or heavier bead is required. Designed for urethane-bonded fixed-glass installations where foam-core butyl is specified. Not intended for mechanically-fastened glass — use solid-core butyl for those applications.\u003c\/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is foam-core butyl and why is it different from solid-core?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eFoam-core butyl has a cellular foam center wrapped in butyl. The foam compresses as the glass is set and rebounds to fill gaps and voids, creating a conforming, leak-free seal. Solid-core butyl seals well but doesn't have the same rebound. Ford, Lincoln, Mercury OE procedures and many professional installation quality standards require foam-core because of this superior void-filling and leak-resistance characteristic.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhen should I use 8mm vs. 6mm foam-core butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eThe 8mm profile (ME810B) is used when the OEM procedure or the vehicle's pinch weld channel calls for a wider bead — typically larger vehicles, vans, trucks with wide channel openings, or custom van and RV windows. The 6mm profile (ME612C) covers the majority of standard passenger cars and light trucks. When in doubt, match to the OEM procedure or measure the channel width.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhich vehicles require foam-core butyl by OEM spec?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eMany Ford, Lincoln, and Mercury vehicles specifically call out foam-core butyl in their OEM windshield installation procedures. When servicing a Ford platform, default to foam-core. For other makes, refer to the vehicle-specific procedure — both foam-core and solid-core are used industry-wide, and using the wrong type can affect seal quality.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eDoes foam-core butyl work in cold weather?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. Marcy foam-core butyl remains workable across a wide temperature range. In temperatures below 40°F, warm the tape slightly before application to improve conformability and adhesion to the pinch weld. Avoid overheating — excessive heat will deform the foam core before the glass is set.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhy is individually boxed butyl useful for mobile installers?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eThe Butyl-in-a-Box format keeps the tape clean and protected from dust, UV, and contamination until needed. For mobile installers working from a van or truck, it eliminates the handling issues of unwrapped bulk rolls and simplifies per-job material tracking. Each box contains a single-application length — open, use, done.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Marcy","offers":[{"title":"Default Title","offer_id":44394654007511,"sku":"ME810B","price":8.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0499\/4262\/6461\/files\/butyl_page_img_af85a855-7e98-4d7e-96a0-529ba983c22e.jpg?v=1705083840"},{"product_id":"copy-of-solid-core-butyl-1-4-x-10-round-individually-boxed","title":"Marcy Solid-Core Butyl Tape — 5\/16\" × 10ft | Individually Boxed | ME825","description":"\u003cp\u003e✅ \u003cstrong\u003eIn Stock\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMarcy ME825 solid-core butyl tape in a single-application box — the 5\/16\" round profile for mechanically-fastened glass and general automotive sealing where a medium-diameter bead is needed. Steps up from the standard 1\/4\" when the channel or gap requires a fuller butyl profile to seal completely. Works reliably in hot and cold weather. Individually boxed for the mobile installer — no cutting, no re-wrapping. \u003cstrong\u003eNot intended for windshield installation — use foam-core butyl (ME612C or ME810B) for windshield applications.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e ME825\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 5\/16\" (7.9mm) round × 10ft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Type:\u003c\/strong\u003e Solid-core\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Individually boxed (single-application)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mechanically-fastened side and back glass, door vapor barriers, general automotive sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplication\u003c\/h2\u003e\n\u003cp\u003eApply along the glass channel or frame opening before pressing the glass into position. The 5\/16\" profile fills wider channels than the standard 1\/4\" while remaining manageable for positioning the glass. For mechanically-fastened side, rear, and quarter glass and general body sealing. Do not use for urethane windshield installations — use foam-core butyl for those.\u003c\/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is solid-core butyl used for?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core butyl is the correct sealant for mechanically-fastened glass — side windows, vent glass, sliding rear windows, and quarter glass on trucks and SUVs where fasteners hold the glass in position. It is also used for door poly vapor barrier re-adhesion and general body sealing where a flexible, weather-resistant bead is needed. It is not the correct product for urethane-bonded windshield installation — use foam-core butyl for those.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhen should I use 5\/16\" instead of 1\/4\" or 3\/8\"?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eUse 5\/16\" (ME825\/ME815S) when the channel gap is too wide for the 1\/4\" bead to fill completely, but the 3\/8\" diameter would create too much resistance positioning the glass. The 5\/16\" is the middle profile — common on mid-size trucks, vans, and SUVs with moderately wider channels than standard passenger cars. When in doubt, match to the gap width in the seated position.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the difference between solid-core and foam-core butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core butyl is an all-butyl bead that seals effectively for mechanically-fastened glass. Foam-core butyl has a foam center that provides rebound compression — this is required for urethane windshield installation where the foam fills voids as the glass cures. Do not substitute one for the other in windshield applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eDoes solid butyl work in both hot and cold weather?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYes — Marcy solid butyl is formulated for all-weather use. In cold temperatures it stiffens slightly but remains workable with light warming. In hot weather it becomes softer and more pliable, which aids application but requires care not to stretch the bead during placement.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eShould I use boxed or bulk solid butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eIndividually boxed (ME625, ME825, ME925) is ideal for mobile installers — each box is a clean, single-application length. Bulk packs (ME615S, ME815S, ME915S) offer a longer roll at lower cost per foot, better value for shops doing high-volume work where material efficiency outweighs the per-job convenience of the boxed format.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Marcy","offers":[{"title":"Default Title","offer_id":44394658234583,"sku":"ME825","price":9.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0499\/4262\/6461\/files\/51Wtvh3RNqL._AC_SL1200.jpg?v=1705087892"},{"product_id":"copy-of-solid-core-butyl-5-16-x-10-round-individually-boxed","title":"Marcy Solid-Core Butyl Tape — 3\/8\" × 10ft | Individually Boxed | ME925","description":"\u003cp\u003e✅ \u003cstrong\u003eIn Stock\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMarcy ME925 solid-core butyl tape in a single-application box — the 3\/8\" round profile for mechanically-fastened glass applications with larger channel gaps and for heavy-duty body sealing tasks. The widest standard solid butyl profile, filling gaps that smaller diameters can't seal properly. Works reliably in hot and cold weather. Individually boxed for the mobile installer — no cutting, no re-wrapping. \u003cstrong\u003eNot intended for windshield installation — use foam-core butyl (ME612C or ME810B) for windshield applications.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e ME925\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\" (9.5mm) round × 10ft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Type:\u003c\/strong\u003e Solid-core\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Individually boxed (single-application)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mechanically-fastened glass with wide channels, heavy-duty body sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplication\u003c\/h2\u003e\n\u003cp\u003eApply along the glass channel or frame opening before pressing the glass into position. The 3\/8\" profile is the largest standard solid butyl size, used when a substantial bead is needed to fill a wide channel gap completely. For mechanically-fastened side, rear, and quarter glass on larger trucks and vans. Do not use for urethane windshield installations — use foam-core butyl for those.\u003c\/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is solid-core butyl used for?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core butyl is the correct sealant for mechanically-fastened glass — side windows, vent glass, sliding rear windows, and quarter glass where fasteners hold the glass in position. It is also used for door poly vapor barrier re-adhesion and general body sealing where a flexible, weather-resistant bead is needed. It is not the correct product for urethane-bonded windshield installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhen should I use 3\/8\" instead of 1\/4\" or 5\/16\"?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eThe 3\/8\" (ME925\/ME915S) is used when the channel gap is large enough that smaller profiles leave voids or don't compress enough to fully seal. Common applications include larger trucks, full-size vans, and commercial vehicles with wider glass channels, or any installation where the OEM procedure calls for a 3\/8\" butyl bead specifically. When in doubt, verify the channel width in the seated glass position.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the difference between solid-core and foam-core butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core butyl is an all-butyl bead that seals effectively for mechanically-fastened glass. Foam-core butyl has a cellular foam center that provides rebound compression for urethane windshield installation, where the foam fills voids as the glass settles during cure. Do not substitute one for the other in windshield applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eDoes solid butyl work in both hot and cold weather?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYes — Marcy solid butyl is formulated for all-weather use. In cold temperatures it stiffens slightly but remains workable with light warming. In hot weather it becomes softer, which aids conformability but requires care not to stretch or distort the bead during placement.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eShould I use boxed or bulk solid butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eIndividually boxed (ME625, ME825, ME925) is ideal for mobile installers — each box is a clean, single-application length ready to use on the job. Bulk packs (ME615S, ME815S, ME915S) offer a longer roll at lower cost per foot, better value for shops doing high-volume work where material efficiency matters more than per-job convenience.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Marcy","offers":[{"title":"Default Title","offer_id":44394664853719,"sku":"ME925","price":11.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0499\/4262\/6461\/files\/41uMd0QNYJL._SL1200_19e7df8a-55d5-473d-a513-06ec49c7bde4.jpg?v=1705088090"},{"product_id":"me615s-marcy-solid-core-butyl-tape-round-1-4-x-15ft-bulk","title":"Marcy Solid-Core Butyl Tape — 1\/4\" × 15ft | Bulk Pack | ME615S","description":"\u003cp\u003e✅ \u003cstrong\u003eIn Stock\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMarcy ME615S solid-core butyl tape in a 15-foot bulk roll — the 1\/4\" round profile for shops doing high-volume mechanically-fastened glass work where cost per foot matters. Same all-weather solid butyl formula as the individually boxed ME625, in a longer roll with a lower cost per foot. Suitable for sealing mechanically-fastened side and back glass, re-adhering door vapor barriers, and general automotive sealing tasks. Made in the USA. \u003cstrong\u003eNot intended for windshield installation — use foam-core butyl (ME612C or ME810B) for windshield applications.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e ME615S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\" (6.4mm) round × 15ft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Type:\u003c\/strong\u003e Solid-core\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Bulk roll\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMade in:\u003c\/strong\u003e USA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mechanically-fastened side and back glass, door vapor barriers, general automotive sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplication\u003c\/h2\u003e\n\u003cp\u003eApply along the glass channel or frame opening before pressing the glass into position. Cut to length as needed. For mechanically-fastened side, rear, and quarter glass, door poly vapor barrier re-adhesion, and general body sealing tasks. Do not use for urethane windshield installations.\u003c\/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is solid-core butyl used for?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core butyl seals mechanically-fastened glass — side windows, vent glass, sliding rear windows, and quarter glass where fasteners hold position. Also used for door poly vapor barrier re-adhesion and general body sealing. It is not the correct product for urethane-bonded windshield installation — use foam-core butyl for those applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the difference between the bulk ME615S and the boxed ME625?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eBoth contain the same 1\/4\" solid-core butyl formula. ME625 is individually boxed in a pre-cut 10-foot single-application length — ideal for mobile installers who want clean, ready-to-use tape on the job. ME615S is a 15-foot bulk roll at a lower cost per foot — better suited to shop environments doing multiple installations where roll management is practical and material cost per job matters.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhen should I use 1\/4\" vs. 5\/16\" vs. 3\/8\" solid butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eThe 1\/4\" profile (ME615S\/ME625) handles the majority of standard applications and is the most commonly used diameter. Use 5\/16\" (ME815S\/ME825) or 3\/8\" (ME915S\/ME925) when the channel or gap is wider and a fuller bead is needed to seal properly. Match the profile to the gap width in the seated glass position.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eDoes solid butyl work in both hot and cold weather?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. Marcy solid butyl is formulated for all-weather use. In cold temperatures it stiffens slightly — warm slightly before application for better conformability. In hot weather it's softer and more pliable, aiding application but requiring care not to stretch the bead during placement.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the difference between solid-core and foam-core butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core butyl is an all-butyl bead suited for mechanically-fastened glass and sealing tasks. Foam-core has a cellular foam center that compresses and rebounds — required for urethane windshield installation where the foam fills settling voids during cure. Do not substitute one for the other in windshield applications.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Marcy","offers":[{"title":"Default Title","offer_id":46410210836695,"sku":"ME615S","price":9.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0499\/4262\/6461\/files\/marcy-butyl-tape-e0dd5321-2_16dea319-fa6a-4ce7-a7c4-414e759451ff.webp?v=1750020933"},{"product_id":"me815s-marcy-solid-core-butyl-tape-5-16-x-15ft-round-bulk","title":"Marcy Solid-Core Butyl Tape — 5\/16\" × 15ft | Bulk Pack | ME815S","description":"\u003cp\u003e✅ \u003cstrong\u003eIn Stock\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMarcy ME815S solid-core butyl tape in a 15-foot bulk roll — the 5\/16\" round profile for shops doing high-volume mechanically-fastened glass work where a medium-diameter bead is needed. Same all-weather solid butyl formula as the individually boxed ME825, in a longer roll at a lower cost per foot. For applications where the standard 1\/4\" diameter is too narrow to seal the channel completely. Made in the USA. \u003cstrong\u003eNot intended for windshield installation — use foam-core butyl (ME612C or ME810B) for windshield applications.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e ME815S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 5\/16\" (7.9mm) round × 15ft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Type:\u003c\/strong\u003e Solid-core\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Bulk roll\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMade in:\u003c\/strong\u003e USA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mechanically-fastened side and back glass, general automotive sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplication\u003c\/h2\u003e\n\u003cp\u003eApply along the glass channel or frame opening before pressing the glass into position. Cut to length as needed. The 5\/16\" profile fills wider channels than the standard 1\/4\" — common on mid-size trucks, vans, and SUVs. Do not use for urethane windshield installations.\u003c\/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is solid-core butyl used for?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core butyl seals mechanically-fastened glass — side windows, vent glass, sliding rear windows, and quarter glass where fasteners hold position. Also used for door poly vapor barrier re-adhesion and general body sealing. It is not the correct product for urethane-bonded windshield installation — use foam-core butyl for those applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the difference between the bulk ME815S and the boxed ME825?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eBoth contain the same 5\/16\" solid-core butyl formula. ME825 is individually boxed in a pre-cut 10-foot single-application length — ideal for mobile installers. ME815S is a 15-foot bulk roll at a lower cost per foot — better suited to shop environments doing multiple installations where material cost per job is the priority.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhen should I use 5\/16\" instead of 1\/4\" or 3\/8\"?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eUse 5\/16\" when the channel gap is too wide for the 1\/4\" to fill completely, but the 3\/8\" would make glass positioning difficult. The 5\/16\" is the middle profile — common on mid-size trucks, vans, and SUVs with moderately wider channels than standard passenger cars. Match the profile to the gap width in the seated glass position.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eDoes solid butyl work in both hot and cold weather?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. Marcy solid butyl is formulated for all-weather use. Warm slightly in cold conditions for better conformability. In hot weather, handle carefully to avoid stretching the bead during placement.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the difference between solid-core and foam-core butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core is an all-butyl bead suited for mechanically-fastened glass and general sealing. Foam-core has a foam center that rebounds to fill voids — required for urethane windshield installation. Do not substitute one for the other in windshield applications.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Marcy","offers":[{"title":"Default Title","offer_id":46410306486487,"sku":"ME815S","price":10.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0499\/4262\/6461\/files\/marcy-butyl-tape-e0dd5321-2_685b4ec2-b7e3-4775-87c5-87661344dabd.webp?v=1750020900"},{"product_id":"me915s-marcy-solid-core-butyl-tape-3-8-x-15ft-round-bulk","title":"Marcy Solid-Core Butyl Tape — 3\/8\" × 15ft | Bulk Pack | ME915S","description":"\u003cp\u003e✅ \u003cstrong\u003eIn Stock\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMarcy ME915S solid-core butyl tape in a 15-foot bulk roll — the 3\/8\" round profile for shops doing high-volume work on larger vehicle channels and commercial applications requiring a heavy butyl bead. Same all-weather solid butyl formula as the individually boxed ME925, in a longer roll at a lower cost per foot. The widest standard solid butyl profile, filling gaps that smaller diameters can't seal completely. Made in the USA. \u003cstrong\u003eNot intended for windshield installation — use foam-core butyl (ME612C or ME810B) for windshield applications.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e ME915S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 3\/8\" (9.5mm) round × 15ft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Type:\u003c\/strong\u003e Solid-core\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Bulk roll\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMade in:\u003c\/strong\u003e USA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mechanically-fastened glass with wide channels, commercial vehicle sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplication\u003c\/h2\u003e\n\u003cp\u003eApply along the glass channel or frame opening before pressing the glass into position. Cut to length as needed. The 3\/8\" profile fills large channel gaps on full-size trucks, vans, and commercial vehicles where smaller diameters would leave voids. Do not use for urethane windshield installations.\u003c\/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is solid-core butyl used for?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core butyl seals mechanically-fastened glass — side windows, vent glass, sliding rear windows, and quarter glass where fasteners hold position. Also used for general automotive body sealing. It is not the correct product for urethane-bonded windshield installation — use foam-core butyl for those applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the difference between the bulk ME915S and the boxed ME925?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eBoth contain the same 3\/8\" solid-core butyl formula. ME925 is individually boxed in a pre-cut 10-foot single-application length — ideal for mobile installers. ME915S is a 15-foot bulk roll at a lower cost per foot — better suited to shops doing high-volume work where material efficiency is the priority.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhen should I use 3\/8\" instead of 1\/4\" or 5\/16\"?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eThe 3\/8\" profile (ME915S\/ME925) is used when the channel gap is large enough that smaller diameters don't fill it completely. Most common on larger trucks, full-size vans, and commercial vehicles with wide glass channels. When in doubt, verify the channel width with the glass in the seated position — the butyl should compress to fill the gap without excessive resistance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eDoes solid butyl work in both hot and cold weather?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. Marcy solid butyl is formulated for all-weather use. Warm slightly in cold conditions for better conformability. In hot weather, handle carefully to avoid stretching the bead during placement.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eWhat is the difference between solid-core and foam-core butyl?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp\u003eSolid-core is an all-butyl bead suited for mechanically-fastened glass and general sealing. Foam-core has a foam center that rebounds to fill settling voids — required for urethane windshield installation. Do not substitute one for the other in windshield applications.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Marcy","offers":[{"title":"Default Title","offer_id":46410372808919,"sku":"ME915S","price":12.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0499\/4262\/6461\/files\/marcy-butyl-tape-e0dd5321-2.webp?v=1750020865"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0499\/4262\/6461\/collections\/butyl-tape.svg?v=1778908126","url":"https:\/\/southmountainsupply.com\/collections\/butyl-tape.oembed","provider":"South Mountain Supply ","version":"1.0","type":"link"}