Foam Core Butyl Tape 4mm X 15 Ft. - Automotive Window Installation - 1 Roll Modular Glass and Window Sealant Auto Glass Replacement Product Sunroofs, Pickup Sliders, Custom Vans, Motor Homes, Recreation Vehicles, Trailers, Watercraft. Multifunctional for seals around panels, fenders, components, and irregular surfaces. It provides a unique compression recovery capability that solid Butyl does not have.