✓ In stock — ships within 1 business day Marcy PUGM5 is a 6mm firm sponge underglass molding — controlled compression for vehicles with shallower pinch welds. Firm sponge construction gives slightly under the glass for a good seat while resisting enough to maintain a consistent glass height. Made in the USA. Sold per 75-foot roll. Specifications Width: 6mm Length: 75ft per roll Profile: Firm Sponge Brand: Marcy Made in: USA Part Number: PUGM5 Width Selection Guide PUGM5 at 6mm firm sponge is ideal for vehicles with slightly shallower pinch welds than the 7mm options. For the same firm sponge behavior at 7mm, see PUGM4. For a softer sponge at 5mm, see PUGM2. For the narrowest solid option, see PUGM1 (8mm solid). What is underglass molding used for? Underglass molding sits along the pinch weld before the glass is set into the urethane. It keeps the glass at the correct height, prevents sinking before the urethane cures, and protects the glass edge from direct metal contact. What makes firm sponge different from standard sponge and solid? Standard sponge compresses more readily — best for uneven pinch welds where maximum conformity is needed. Solid doesn't compress at all — a fixed, predictable height. Firm sponge (this product) is the middle ground: it gives slightly for better glass seating than solid, while resisting enough to give the installer more height control than a soft sponge. Many technicians use firm sponge as their default underglass choice. How many feet of underglass molding does a typical installation require? A standard passenger vehicle windshield requires approximately 10–14 feet of underglass molding. A 75-foot roll covers 5–7 complete installations — a practical stock quantity for active technicians. Is Marcy PUGM compatible with urethane and ribbon sealer installations? Yes — Marcy PUGM works with both urethane and ribbon sealer. Firm sponge is well-suited to urethane applications where the installer wants more height control than standard sponge provides while still having some give for glass seating. How does PUGM5 compare to PUGM4? PUGM5 (6mm firm sponge) and PUGM4 (7mm firm sponge) have identical compression behavior — only the width differs. Use PUGM5 when the pinch weld depth is closer to 6mm; use PUGM4 when it's closer to 7mm. If you're between sizes, the slightly wider option generally provides a better seal.
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