Marcy Solid-Core Butyl Tape — 1/4" × 10ft | Individually Boxed | ME625
✅ In Stock
Marcy 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. Not intended for windshield installation — use foam-core butyl (ME612C or ME810B) for windshield applications.
Specifications
- Part Number: ME625
- Size: 1/4" (6.4mm) round × 10ft
- Core Type: Solid-core
- Format: Individually boxed (single-application)
- Application: Mechanically-fastened side and back glass, door vapor barriers, general automotive sealing
Application
Apply 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.
What is solid-core butyl used for?
Solid-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.
What is the difference between solid-core and foam-core butyl?
Solid-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.
When should I use 1/4" vs. 5/16" vs. 3/8" solid butyl?
The 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.
Does solid butyl work in both hot and cold weather?
Yes — 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.
Should I use boxed or bulk solid butyl?
Individually 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.