Marcy Setting Block Foam Tape — 1/4" × 1/4" × 18ft | High Density | ME6494
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Marcy ME6494 high-density foam tape prevents glass from sinking, reduces road noise, and delivers a professional flush finish on auto glass installations. Single-sided adhesive bonds to the vehicle body, allowing post-placement adjustment of the glass before the urethane sets. The high-density foam maintains its 1/4" profile under glass load — it won't compress flat and let the glass settle during cure. Compatible with all urethane adhesive types. Flexible enough to follow contoured sills and round corners without buckling.
Specifications
- Part Number: ME6494
- Height: 1/4" (6.4mm)
- Width: 1/4" (6.4mm)
- Length: 18ft per roll
- Adhesive: Single-sided (body side)
- Density: High
- Application: Setting blocks for auto glass installation
Application
Apply to the sill area of the vehicle opening before glass installation. The foam tape acts as a setting block, maintaining the correct glass height while urethane cures. Single-sided adhesive keeps the glass free to reposition if needed before the urethane sets. Cut to length with scissors or a razor blade.
What does setting block foam tape do?
Setting block foam tape sits between the bottom edge of the glass and the vehicle body. Its primary purpose is to hold the glass at the correct installation height so it doesn't sink under its own weight before the urethane cures. Without setting blocks, heavy glass can settle unevenly during cure, causing fitment and leak problems. High-density foam maintains its height under load throughout the cure period.
Why is the adhesive only on one side?
The single-sided adhesive bonds to the car body but leaves the glass free to be positioned and adjusted. If the tape adhered to both surfaces, any glass repositioning after placement would tear the tape. The glass rests on top of the foam profile — held by its weight and eventually by the curing urethane — while the foam maintains consistent height underneath.
When should I use 1/4" height vs. 5/16" height foam tape?
The 1/4" height (ME6494) is the standard for most passenger vehicles with typical glass-to-body clearances. The 5/16" height (ME6495) is used when a taller setting block is needed — for vehicles with deeper channels, thicker glass edges, or when the OEM installation procedure specifies a taller block. Match the height to the gap between the glass bottom edge and the pinch weld with the glass in the seated position.
How much foam tape does a typical installation use?
Most installations use two to four short sections placed along the bottom sill — typically 3–8 inches each for a total of 8–20 inches per installation. At 18 feet per roll, one ME6494 provides enough tape for many vehicles. Cut strips to length with scissors or a razor blade.
Is this tape compatible with all urethane adhesives?
Yes — ME6494 is compatible with all standard urethane adhesives used in automotive glass installation. The foam does not react with or inhibit urethane curing. It works across all OEM-grade, extended-cure, and fast-cure urethane systems.