3M Marine Adhesive Sealant 5200 - Permanent Polyurethane Boat Sealant, Available in 3 fl oz to 10 fl oz, Black or White

3M Marine Adhesive Sealant 5200 is the industry-standard permanent polyurethane adhesive sealant for bonding and sealing above and below the waterline. Formulated to create a rock-solid, flexible bond between fiberglass, wood, and metal, 5200 is the go-to choice for deck-to-hull joints, hardware and fitting installation, hull seams, portholes, and transom-mounted hardware on boats and RVs. Once cured, the elastomeric bond resists vibration, shock, and the constant expansion and contraction of a marine environment, while standing up to saltwater, fuel, and weathering for the life of the vessel.

This line is offered in two cartridge sizes to match jobs of any scale, from small hardware repairs to full hull-seam applications, and in Black or White to blend with common deck and hull finishes.

Specifications

• Brand: 3M
• Model: 5200
• Item Form: Paste
• Compatible Material: Fiberglass, Metal, Wood
• Water Resistance Level: Waterproof, rated above and below the waterline
• Cure Time: Tack-free in 1 to 2 hours, fully cures within 48 hours
• Bond Type: Permanent, flexible elastomeric

Sizes & Options

Choose the 3 fl oz tube for small repairs, single fittings, or touch-up work where precision and minimal waste matter. Choose the 10 fl oz cartridge (used with a standard caulking gun) for larger jobs such as deck-to-hull seams, transom mounting, or multiple hardware installs. Match the color to your existing gelcoat or hardware finish: Black for dark hulls, trim, and hardware; White for light-colored decks and hulls where the cured sealant should blend in rather than stand out.