LIFE-CALK SEALANT is the industry's number one sealant. Millions of tubes and cartridges sold throughout the world. One part Thiokol Base Polysulfide rubber sealant cures to a positive waterproof seal. Resists oil, gas, brine, water, weather and most chemicals. Stays seaworthy for years. Bonds to wood, fiberglass, metal, plastic and glass. No priming required except on oil woods such as teak. Finest marine sealant available. Can be sanded and painted. Color: White. In Cartridge.