Sudbury 301 Marine Sealant – 10 oz. Cartridge, Clear
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Sudbury 301 Marine Sealant – 10 oz. Cartridge, Clear
Sudbury 301 is a single-component, fast-skinning marine sealant in a standard 10 oz. caulk cartridge, curing to a clear, flexible finish. It’s the high-volume choice for larger sealing jobs where appearance matters and a colored bead would be visible — portlights, windows, and bright-finish hardware on any hull color. It skins in approximately 10 minutes and reaches full cure in 1–7 days, forming a durable, watertight bond 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)
- Clear finish — virtually invisible once cured, works on any hull color
- 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
- Standard 10 oz. cartridge — fits any standard caulk gun
- Cleanup with mineral spirits
- Not recommended for wood deck seams
Compatible Applications
- Portlights, windows, and hatches on any hull color where a clear seal is preferred
- Continuous runs on transparent or mixed-color deck hardware
- Through-hull fittings and keel bolt seals on light or multi-color hulls
- Cabin sole, interior trim, and hardware where aesthetics matter
- Any large-area sealing project requiring a flexible, permanent, invisible bond
Parts Desk Insights
The 301 is the go-to clear sealant for larger jobs — best suited for portlights, window runs, and any continuous bead where you’d burn through a 3 oz. tube fast. The cartridge format works with any standard caulk gun and is the practical choice for production work or bigger repairs. For smaller touch-up jobs or tight spaces where a gun isn’t practical, see the Sudbury 321x – 3 oz. Tube, Clear. Need a black or white finish in cartridge format? See the Sudbury 302 – 10 oz. Cartridge, Black or the Sudbury 300 – 10 oz. Cartridge, White.
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.