3M MMM05220 Marine Adhesive Sealant 5200 Fast Cure White 3 oz Tube

3M Marine Adhesive Sealant 5200 Fast Cure is a one-component, high-strength, moisture-curing polyurethane adhesive sealant engineered specifically for the marine environment. This 3 oz tube in white delivers permanent, watertight bonds above and below the waterline — making it one of the most trusted marine sealants available.

The fast-cure formula reacts with atmospheric moisture to become tack-free in approximately 1–2 hours and reaches a full cure in roughly 24–48 hours, significantly faster than standard 3M 5200. The cured sealant remains permanently flexible, forming a tough elastomeric bond that resists saltwater, weathering, shock, vibration, swelling, and shrinking.

Key Features:

• One-part, moisture-curing polyurethane formula — no mixing required
• Tack-free in 1–2 hours; full cure in approximately 24–48 hours
• Tensile strength of 600 psi for high-demand bonding applications
• Bonds dissimilar materials including wood, fiberglass, gelcoat, aluminum, plastics, and metals
• Effective above and below the waterline
• Non-sag, medium-paste consistency — suitable for vertical and horizontal seams
• Permanently flexible bond absorbs stress from vibration, shock, swelling, and shrinking
• Excellent resistance to saltwater and weathering
• Cleans up with mineral spirits or kerosene before cure
• White color — part number 05220, 3 oz tube

Recommended Applications:

• Fiberglass deck-to-hull joints
• Wood-to-fiberglass bonding
• Portholes and deck hardware installation
• Motor mounting on fiberglass transoms
• Hull seams above and below the waterline
• Rub rail attachment and stanchion supports
• Stern joints and centerboard trunk joints
• Under-molding and deck housing

Store product between 60–80°F (16–27°C) for maximum shelf life. Applied using a standard caulking gun or directly from the tube, 3M Marine Adhesive Sealant 5200 Fast Cure is the go-to solution for permanent marine bonding and sealing jobs.