Devcon VersaChem Black Silicone forms a tough, flexible silicone rubber gasket that resists aging and weathering for a leak proof seal. This high-strength, moisture-curing, and gasketing black silicone maintains long-term durability and flexibility and is ideal for bonding, sealing, insulating, repairing, filling voids, and more. OEM (Original Equipment Manufacturer) approved, this black silicone formula is non-flammable, waterproof, low volatile, and oxygen sensor safe. Use it to repair ripped vinyl, boat hulls and deck joints, weather-stripping, sealing windows, door frames, and more. The waterproof black silicone works best on metal, glass, natural and synthetic fiber, vinyl, rubber, plastic, concrete, ceramic, painted surfaces, and silicone rubber.