Need a material that provides a waterproof barrier? Seahcoice elastomeric sealant is a great choice. It can be used below or above the waterline. Fast curing and permanently flexible it gives a full cure in 1 to 7 days at 40 deg. F to 130 deg. F. Adheres tenaciously to fiberglass, wood, metal, glass, plexiglass, Lexan and other plastics.