Sudbury 321x Marine Sealant – 3 oz. Tube, Clear
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Sudbury 321x Marine Sealant – 3 oz. Tube, Clear
Sudbury 321x is a single-component, fast-skinning marine sealant that cures to a clear, flexible finish — ideal for applications where appearance matters and a visible bead would detract from the finished look. It skins in approximately 10 minutes and reaches full cure in 1–7 days, forming a watertight, durable 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
- 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
- Portlights, windows, and hatches where a clear seal is preferred
- Transparent or light-colored hull and deck hardware bedding
- Through-hull fittings on white or gelcoat surfaces
- Cabin sole and interior hardware where aesthetics matter
- General marine hardware installation requiring a flexible, permanent, invisible bond
Parts Desk Insights
The 321x is the clear-finish choice in the Sudbury 3 oz. tube lineup — best suited for portlights, windows, and any fitting where a black or white bead would be visible and unwanted. The tube format is ideal for smaller jobs and tight spaces where a cartridge gun isn't practical. For larger clear-sealant projects, pair with the Sudbury 301 Sealant – 10 oz. Cartridge, Clear. If color match is needed, see the Sudbury 322 – 3 oz. Tube, Black or Sudbury 320 – 3 oz. Tube, 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.