One-part all-purpose polyurethane that 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.
4200 is approximately 1/2 the strength of 3M 5200, which allows for disassembly of parts. Great for bedding screws for fittings on dinghies of all types to prevent leaks.