3M 4000UV Fast Cure Marine Sealant – White, 3 oz. Tube
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
3M 4000UV Fast Cure Marine Sealant – White, 3 oz. Tube
Keep water where it belongs — outside the boat. The 3M 4000UV is a single-component, fast-curing marine sealant that forms a firm, flexible, waterproof bond above or below the waterline. Engineered for the demands of the marine environment, it handles the constant flex, vibration, and UV exposure that breaks down lesser sealants over time.
Whether you're sealing deck hardware, through-hulls, or trim pieces, the 4000UV delivers a clean, professional finish that holds up season after season.
Key Features
- Single-component formula — no mixing required
- Tack-free in under 2 hours; fully cured in 24 hours
- Firm, rubbery seal that flexes with the boat
- Superior UV resistance — won't yellow or degrade in sunlight
- Suitable for use above and below the waterline
- White finish for a clean, finished look on light-coloured surfaces
Compatible Applications
- Deck hardware and fittings
- Through-hull fittings
- Portlights and hatches
- Trim and molding
- Windshields and windows
- Transducer mounting
Parts Desk Insights
Best use case: The 4000UV is the go-to choice when you need a fast turnaround — ideal for weekend projects or in-season repairs where you can't wait days for a cure. It's a step below the permanent bond of 3M 5200 or 3M 4200, making it a better fit for hardware you may eventually need to remove. If you're sealing something you never want to take apart, consider the 5200. For most deck hardware and above-waterline applications, the 4000UV hits the sweet spot of strength, flexibility, and workability.
Also available in a 10 oz. cartridge for larger jobs.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.