3M Marine Adhesive/Sealant is a fast-curing, one-part polyurethane that chemically reacts with moisture to create strong, flexible bonds ideal for marine applications. Whether you’re sealing boat hardware, bonding fiberglass, or joining wood components, this sealant delivers water-tight, weather-resistant seals that perform above and below the waterline. The polyurethane formula provides excellent adhesion to wood and fiberglass while maintaining durability in demanding saltwater and coastal environments.
This marine-grade sealant is engineered to handle the stresses of boating and waterfront use. Its flexibility allows it to absorb and dissipate stress caused by shock, vibration, material swelling, and shrinking—common challenges in marine environments. The 10 oz. cartridge format is recognized as the long-standing standard for marine adhesive applications.
Features and Benefits
- Fast-Curing Formula: Becomes tack-free in approximately 48 hours and fully cures in 5 to 7 days, allowing you to complete repairs efficiently.
- Water-Tight and Weather-Resistant: Forms seals that work above and below the waterline, resisting the elements in marine environments.
- Flexible Adhesive Bond: The polyurethane base absorbs vibration and movement, allowing it to dissipate stress from shock, vibration, and material expansion and contraction.
- Strong Adhesion to Key Materials: Bonds well to wood and fiberglass, the primary materials found in boat construction and repair.
- No Sagging or Shrinkage: Applies smoothly and evenly, holding its shape on vertical and horizontal seams without drooping, and cures without shrinking.
Specifications
- Brand: 3M
- Model: 6500
- Color: White
- Size: 10 oz. cartridge (1/10 gallon)
- Type: One-part polyurethane marine adhesive/sealant
- Application Temperature Range: 40 to 100 degrees Fahrenheit
- Tack-Free Time: Approximately 48 hours
- Full Cure Time: 5 to 7 days
