Life-Calk is a long lasting, permanently flexible marine polysulfide sealant which can be sanded, painted***, and used above and below the waterline. It is a moisture curing system and under ideal conditions it will be tack-free in 1 to 3 days and fully cured in 7 to 10 days. Life-Calk exhibits excellent resistance to teak oils, gasoline, and diesel fuel. It is ideal to use on teak decks, to bed deck and hull hardware, seal thru-hull fittings, and underwater seams. A versatile product, it will bond to fiberglass, wood, metal, glass, and itself., and cure to a firm flexible rubber seal with excellent waterproofing and adhesion qualities. It can be applied underwater for emergency repairs and also can be applied to damp surfaces. Same formula since 1959 and still our hottest seller!