3M Marine Adhesive Sealant 4000 UV tube close-up showing waterproof, flexible seal.
3M Marine Adhesive Sealant 4000 UV on aluminum surface demonstrates color stability.
3M Marine Adhesive Sealant 4000 UV applying under deck hardware for gap filling.
3M Marine Adhesive Sealant 4000 UV exposed to sun highlights UV resistance.
3M Marine Adhesive Sealant 4000 UV packaging and 3 oz tube for marine repairs.

3M

3M Marine Adhesive Sealant 4000 UV – Medium-Strength Waterproof Marine Sealant (3 oz)

High-performance tools and home improvement made for confident daily results

$23.54

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Why customers choose TaskHolt Tools

Overview

3M Marine Adhesive Sealant 4000 UV is a one-component, moisture-curing sealant designed for marine environments. It cures to a firm, flexible, and waterproof seal on aluminum, wood, gel coat, and fiberglass, making it suitable for boats and RVs above or below the waterline. The formulation emphasizes color stability and long-term outdoor performance, even in sun-exposed settings.

Key Benefits

  • Color stable: Maintains its color in applications above and below the water line.
  • Paintable when wet: Forms a skin in 30–60 minutes and can be painted with water-based paints immediately after application.
  • Excellent UV resistance: Durable in sunny, outdoor environments, supporting reliable outdoor performance.
  • Multi-purpose marine sealant: Medium-strength bond for portholes, deck fittings, rub rails, screw holes, and stanchion supports while still allowing disassembly.
  • Flexible bonds: Elastomeric adhesion accommodates joint movement and resists shock, vibration, swelling, and shrinking.
  • Moisture-curing and gap-filling: No mixing required; forms a seal that tolerates uneven gaps.

Typical Uses

  • Port holes and deck fittings
  • Rub rails and screw holes
  • Stanchion supports and other marine hardware
  • Applications above or below the waterline on boats and RVs

Curing and Application Notes

Note: This product is intended for industrial/occupational use. Not for consumer sale or use. It cures to a firm, flexible seal in about 24 hours. A skin forms in 30–60 minutes, and painting can begin after initial set with water-based paints.

FAQ

Q: Which materials does the 3M Marine Adhesive Sealant 4000 UV bond to?

A: It bonds to aluminum, wood, gel coat, and fiberglass for a flexible, waterproof marine seal.

Q: How long does it take to cure and can it be painted?

A: Cures in about 24 hours; a skin forms in 30–60 minutes and painting with water-based paints is possible after initial set.

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