Discover 3M White Marine Adhesive Sealant 5200—a rugged polyurethane sealant engineered for boatbuilding and repairs. The 10 oz tube combines strong adhesive power with a flexible, weatherproof seal that moves with the hull. Its white finish blends with most marine surfaces and resists saltwater, sun, and wind exposure for long-lasting performance. You have up to four hours to shape and tool the material with a putty knife or caulking tool. Handling strength develops in about two days, with a full cure in 5–7 days.

How It Helps You: Beyond the initial grab, this marine-grade sealant forms a resilient barrier that does not shrink as it cures, keeping seams sealed under vibration, movement, and temperature shifts.

• Polyurethane formula delivers a durable marine adhesive and sealant for boats, decks, and hull seams
• Excellent resistance to saltwater, weathering, and UV exposure to protect exterior surfaces
• Non-sag consistency keeps seals in place in vertical or horizontal joints
• Suitable for above and below waterline applications with lasting flexibility
• Easy caulking gun application with up to four hours open time for tidy finishes

Why This Product Stands Out: This marine sealant is built to endure harsh conditions, delivering dependable adhesion, weather resistance, and lasting flexibility. It keeps your vessel watertight while simplifying repairs and maintenance for seasons to come.