A one part, general all purpose polyurethane that chemically reacts with moisture to deliver flexible bonds with good adhesion to wood, fiberglass, gelcoat, plastics and metals. Paintable and sandable. Forms watertight, weather-resistant seals on joints and boat hardware above and below the waterline. Note: For very high strength or irremovable bonds, use 3M 5200 sealant. Not recommended for sealing wood decks.