SolidSeal is a one component, permanently flexible, polyurethane adhesive/sealant. It cures in the presence of atmospheric moisture to produce high strength bonds that can replace rivets, welds, and other fasteners. Silaprene SolidSeal is a polyurethane adhesive with high-adhesion strength – it is designed for permanent adhesion. May be used as a weather-proofing agent to seal joints on fiberglass & cement exterior walls. Color: gray. May be painted. For use with 79521 Heavy Duty Injection Gun.