3M MARINE ADHESIVE SEALANT FAST CURE Fast cure version of 5200 becomes tack free in one to two hours and completely cures within 48 hours. A permanent solution for bonding marine substrates like wood, fiberglass, and metal. Tough yet flexible polyurethane polymer is ideal for deck housings, hull fittings, porthole mounting, fiberglass transoms, and underside molding. Sold by the 10 oz cartridge.