Silicone Rubber Sealant Cartridge - WhiteAn all-purpose, non-corrosive, non-yellowing, mildew resistant, low-odor, 100% marine high quality silicone sealant. Tack-free in 30 minutes or less. *Fully cured in 24 hours. For use above or below the waterline. Will not shrink, crack, or dry out. Superior flexibility and adhesion to fiberglass, plastic, metal, and wood. Retains flexibility and tensile strength even after years of exposure. Acid free cure will not corrode metal.