Product Data Sheet

3M™ Marine Adhesive Sealant 5200 is a premium one-component polyurethane adhesive sealant engineered for permanent bonding and sealing in demanding marine environments. Trusted throughout the marine industry for decades, this moisture-curing sealant creates exceptionally strong, flexible, and watertight bonds that withstand harsh weather, saltwater exposure, vibration, and structural movement.

Designed for above and below waterline applications, 3M™ Marine Adhesive Sealant 5200 bonds aggressively to wood, fiberglass, gelcoat, metals, and many plastics. Its permanently elastic formulation helps absorb shock, vibration, swelling, shrinking, and thermal expansion without cracking or losing adhesion, making it ideal for high-stress marine assemblies.

This high-strength marine sealant forms durable, weather-resistant seals that resist water intrusion and maintain long-term performance in harsh outdoor conditions. Its non-sag consistency allows for clean application on vertical and horizontal surfaces, while its long working time supports precise positioning during assembly and installation.

Common applications include:

• Fiberglass deck-to-hull bonding
• Through-hull fittings and portholes
• Deck hardware and moldings
• Hull seams above and below the waterline
• Wood-to-fiberglass bonding
• Marine transoms and structural joints
• Boat and marine equipment assembly