3M Marine Polyurethane Sealant Black 3 oz Cartridge

High Strength Marine Sealant for Permanent Bonding

This marine polyurethane sealant is designed for permanent bonding and sealing in demanding marine environments. It forms an extremely strong, flexible seal that performs reliably above or below the waterline without shrinking or sagging. Ideal for structural joints and seams, it bonds fiberglass, wood, and composite materials while remaining workable for extended application time.

Features

• Extremely strong polyurethane adhesive and sealant
• Suitable for use above and below the waterline
• Bonds fiberglass to fiberglass and wood to fiberglass
• Remains flexible to handle vibration and structural movement
• Does not shrink, sag, or flow in vertical or horizontal seams
• Workable for up to four hours after application
• Becomes tack free in approximately 48 hours
• Fully cures in five to seven days
• Black color for clean, discreet sealing
• 3 ounce cartridge compatible with manual caulking guns

Product availability varies between locations, and some products are only available online. Please contact your nearest Martin Motor Sports here for availability.