Boatlife Life Calk Polysulfide Sealant Boatlifes Life-Calk is a long lasting, permanently flexible marine polysulfide sealant which can be sanded, painted, and used above and below the waterline. Life Calk Sealant is tack-free in 1 to 3 days, and fully cures in 7-10 days weather dependent. This polysulfide sealant has excellent resistance to teak oils, gasoline and diesel fuel. Boatlife Life-Calk is ideal for teak decks, to bed deck and hull hardware, seal thru-hull fittings, and underwater seam