A one part general purpose polyurethane that chemically reacts with moisture to deliver flexible bonds with good adhesion to wood,fiberglass, gelcoat,certain plastics and metals. Paintable and sandable. Forms watertight, weather- resistant seals on joints and boat hardware above or below the water line. This product is approximately half the strength of 3M Marine Adhesive/Sealent 5200,which allows for disassembly of parts. NOTE: When very high strength or unremovable bonds are required, use 3M Marine Adhesive/Sealent 5200 or 3M Marine Adhesive/Sealent Fast Cure 5200. Not recommended for sealing wood decks because it may be permanently softened by certain teak cleaners or sealers. On plastics, test 3M Marine Adhesive/Sealent Fast Cure 4200 to determine suitability.