3M™ Auto Glass and Body Caulking Butyl Sealer is a versatile adhesive sealer designed specifically for bonding windscreens, quarter lights, and back lights in vehicles and sealing various openings on a car body. This preformed mastic butyl cord is suitable for installing direct glaze (gasketless) windscreens and for use in butyl-bonded glass systems, providing a seal without offering structural strength.