This polyurethane-based formula creates watertight bonds on fiberglass, gelcoat, and wood, making it perfect for deck fittings, through-hull fastenings, railings, and more. Unlike most underwater caulk for pools, marine caulking, marine glue waterproof, marine 5200 sealant, 5200 marine sealant black, marine flooring adhesive, underwater adhesive, 5200 fast cure, and marine 5200 in the market, ours is designed to cure within 24 hours.
