Sudbury 302 Marine Sealant – 10 oz. Cartridge, Black
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You have 30 days to request a return. All sale items are final sale.
Sudbury 302 Marine Sealant – 10 oz. Cartridge, Black
Sudbury 302 is a single-component, fast-skinning marine sealant in a standard 10 oz. caulk cartridge — built for larger sealing jobs where a tube isn’t enough. It skins in approximately 10 minutes and reaches full cure in 1–7 days, delivering a flexible, watertight black bond that holds up in demanding above- and below-waterline environments. The black finish makes it the right choice for dark hulls, black hardware, and any application where a clean, color-matched bead matters.
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)
- Black finish — ideal for dark hulls and black hardware
- 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
- Hull-to-deck joints and long continuous sealing runs on dark hulls
- Through-hull fittings and keel bolt seals
- Rubrail, fendering, and trim installation on black or dark-finish boats
- Below-waterline sealing on fiberglass and metal hulls
- Portlights, hatches, and hardware bedding where a black bead is preferred
- Any large-area sealing project requiring a flexible, permanent black bond
Parts Desk Insights
The 302 is the high-volume black sealant in the Sudbury lineup — best suited for continuous runs, hull-to-deck joints, and any job where you’d go through a 3 oz. tube quickly. The 10 oz. cartridge format works with any standard caulk gun and is the practical choice for production work or larger repairs. For smaller touch-up jobs or tight spaces where a gun isn’t practical, see the Sudbury 322 – 3 oz. Tube, Black. Need a white or clear finish in cartridge format? See the Sudbury 300 – 10 oz. Cartridge, White or the Sudbury 301 – 10 oz. Cartridge, Clear.
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.