3M Company 4200 Fast Cure Polyether Adhesive Sealant Review

3M Company 4200 Fast Cure Polyether Adhesive Sealant

The 3M Fast Cure 4200 White 3oz Tube is a versatile one-part, all-purpose polyurethane adhesive/sealant that undergoes a chemical interaction with moisture. This reaction results in the formation of adaptable bonds with good adhesion properties, making it suitable for a range of materials such as wood, fiberglass, gelcoat, and metals, along with some types of plastic.

This product can guarantee flexible, watertight, and weather-resistant seals on various joints and hardware. It can be utilized effectively either above or below the waterline. However, please note that its strength is only about half that of 3M’s 5200, which enables the potential dismantling of parts.

Special attention should be given to its use on teak decks, as certain teak cleaners or sealers may permanently soften it, hence its usage is not encouraged in these cases. For plastics, compatibility with 3M Fast Cure 4200 must be first tested before usage.

Key Features

  • Creates watertight, weather-resistant seals
  • Chemically reacts with moisture resulting in flexible bonds
  • Can be used above or below the waterline
  • Cleans up with mineral spirits or kerosene


  • Formulation: One-part fast-cure polyurethane adhesive/sealant
  • Recommended Usage: Fiberglass, wood, metal, some plastics, above or below water
  • Material Incompatibility: Acrylics, ABS, Lexan
  • Cure time: Tack-free in 2 hours; Complete cure in 24 hours
  • Cleanup: Mineral spirits or kerosene
  • Removal: Mechanical removal
  • Tensile Strength: 300 psi

When an extremely high strength or unremovable bonds are necessary, it is recommended to use 3M Marine Adhesive/Sealant 5200 or Fast Cure 5200 in place of this product.

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