Sudbury 320 Marine Sealant – 3 oz. Tube, White
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Sudbury 320 Marine Sealant – 3 oz. Tube, White
Sudbury 320 is a single-component, fast-skinning marine sealant that cures to a clean white finish — the right choice for white hulls, gelcoat surfaces, and bright-finish hardware where color match is essential. It skins in approximately 10 minutes and reaches full cure in 1–7 days, forming a flexible, watertight bond that holds up above and below the waterline.
Key Features
- Fast skin time: approximately 10 minutes
- Full cure: 1–7 days depending on temperature and humidity
- Cures in temperatures from −29°C to +49°C (−20°F to +120°F)
- White finish — blends seamlessly with white hulls and gelcoat
- Superior flexibility, elongation, and compression resistance
- Excellent adhesion to fiberglass, wood, metal, glass, Plexiglas, Lexan, and most plastics
- Can be wet-sanded or painted after full cure
- Cleanup with mineral spirits
- Not recommended for wood deck seams
Compatible Applications
- Hardware bedding on white or gelcoat hulls and decks
- Portlights, hatches, and trim on white-finish boats
- Through-hull fittings on light-colored surfaces
- Rubrail and fendering installation on white hulls
- General marine hardware installation where a white, flexible, permanent bond is needed
Parts Desk Insights
The 320 is the white-finish choice in the Sudbury 3 oz. tube lineup — best suited for white-hull boats where a black or clear bead would stand out. The tube format is ideal for smaller jobs, touch-ups, and tight spaces where a cartridge gun isn't practical. For larger white-sealant projects, see the Sudbury 300 Marine Sealant – White, 10 oz. Cartridge. If color match isn't a concern, the Sudbury 321x – 3 oz. Tube, Clear offers a virtually invisible finish, and the Sudbury 322 – 3 oz. Tube, Black is the go-to for dark hulls and hardware.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.