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- Super high strength
- Bonds are watertight
- Use for both above and below waterline
- Weathering and saltwater resistant
3M Marine Adhesive Sealant Fast Cure bonds and seals fiberglass, gelcoat and wood. Ideal for rub-rails, stern-joints, deck and through-hull fittings, and access plates. Medium strength allows for disassembly.
From the manufacturer
The Most Important Component of any Marine Adhesive or Sealant: Trust.
Whether you’re boatbuilding, maintaining a fleet or repairing a single watercraft, you expect your adhesive sealants to create watertight seals. But the right ones will do much more. They will resist weathering, shock, vibration, swelling and shrinkage over time. It also means they will earn your trust. 3M designs quick-applying, long-lasting adhesives and sealants for specific conditions – below the waterline, topside and everywhere in between, on virtually any surface you can find on your boat.
3M Marine Adhesive Sealant 4000 UV 3M Marine Adhesive Sealant 4200 FC 3M Marine Adhesive Sealant 5200 3M Marine Adhesive Sealant 5200 FC 3M Marine Grade Silicone Sealing ✓ ✓ ✓ ✓ ✓ Bonding Excellent Good Excellent Excellent Poor Removable ✓ ✓ ✓ Above Water ✓ ✓ ✓ ✓ ✓ Below Water ✓ ✓ ✓ ✓ Strength Medium Medium High High Low Chemical Base SMP Polyurethane Polyurethane Polyurethane Silicone Curing Time 24 hrs 24 hrs 5 - 7 days 24 hrs 24 hrs Cure Rate (mm per 24 hrs) >3.5 >3 <1 3 3
3M Marine Adhesive Sealant 4000 UV 3M Marine Adhesive Sealant 4200 FC 3M Marine Adhesive Sealant 5200 3M Marine Adhesive Sealant 5200 FC 3M Marine Grade Silicone Electrical Hatch Assembly Best Good Wench/Transom Best Good Best Best Stanchion Good Best Best Port Hole Window Outside (Sealing) Best Dashboard Components Best Cleat Best Good Best Best Port Lights Best Good Rubrail Attachment Best Good Fiberglass Hull Best Best Sealing Screwholes Best Good
The toughest sealants on the sea
Whether you’re bonding trim, toe rails, fittings or fiberglass deck components, or sealing thru-hulls, hatches, hinges, trunk joints or almost anything else on a marine vessel, 3M has an adhesive sealant that’s proven to the task. Our products have set the standard for marine excellence for more than 50 years, and they now include a new generation of advanced polyurethane and silane-modified polymers (SMPs) that further expand their range and effectiveness.
3M Marine Adhesive Sealants are specifically designed for the rigors of the marine environment, bonding or sealing everything from wood, metal and glass to gelcoat and most plastics—including fiber-reinforced plastic (FRP). Boaters have no better friend on the water.
Materials and care
Made from powdercoated aluminum.
Durable, reliable, and ready for adventure.
Due to our small shop setup, at this time returns and changes of heart are not accepted. Once the materials begin their journey to becoming your trusty new cover, there's not really any turning back.