3M 4200FC Marine Sealing adhesive

3M 4200FC Marine Sealing adhesive is a single-component polyurethane sealant that polymerizes with moisture to create flexible, long-lasting weatherproof and seawater-resistant bonds with excellent adhesion to wood, fiberglass, gelcoat, plastics, and metals. It is ideal for sealing deck accessories and boat joints above and below the waterline, and is paintable and sandable for a smooth, finished appearance.