3M 5200 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 5200 Marine Sealant – White, 3 oz. Tube
3M 5200 is the gold standard for permanent marine bonding and sealing. This one-part polyurethane formula creates an incredibly strong, watertight bond that stays flexible for the life of the boat — trusted by boatbuilders and serious boaters for hull-to-deck joints, through-hull fittings, and any application where the seal must never fail. The 3 oz. tube format is ideal for smaller jobs and precision work without a caulking gun.
Key Features
- One-part polyurethane — no mixing required
- Extremely strong permanent bond above and below the waterline
- Workable up to 4 hours after application
- Tack-free in 48 hours; fully cures in 5–7 days with no shrinkage
- Stays flexible — will not sag or flow in vertical or horizontal seams
- Bonds fiberglass-to-fiberglass, fiberglass-to-wood, and more
- 3 oz. squeeze tube — no caulking gun required
Compatible Applications
- Hull-to-deck joints and structural bonding on fiberglass boats
- Through-hull fittings and keel bolt bedding
- Permanent bonding of deck hardware where removal is not anticipated
- Fiberglass-to-fiberglass and fiberglass-to-wood structural seams
- Below-waterline sealing where maximum strength is required
Parts Desk Insights
Best Use Case: 3M 5200 is the right choice when the bond needs to be permanent — hull-to-deck joints, keel bolts, and through-hulls where failure is not an option. Important: because 5200 bonds so aggressively, it is not recommended for deck hardware you may ever need to remove. For hardware that requires future serviceability, the BoatLIFE LifeSeal or BoatLIFE Life-Calk lines offer strong but more workable alternatives. For larger jobs, see the 3M 5200 White Cartridge (06500). For a black bead, see the 3M 5200 Marine Sealant – Black, 3 oz. (71-05205). When you need a faster cure time, the 3M 5200 Fast Cure is available. To remove old sealant or adhesive residue, use 3M Specialty Adhesive Remover.
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.