Star Brite Marine Silicone Sealant – Black, 10.3 oz. Cartridge
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Star Brite Marine Silicone Sealant – Black, 10.3 oz. Cartridge
A 100% marine-grade silicone sealant built to handle the harshest conditions on the water. This cartridge-format sealant bonds to virtually any boat surface, stays permanently flexible across an extreme temperature range, and resists UV, weathering, and most chemicals — making it a reliable choice for deck hardware, fittings, and above- or below-waterline sealing on any vessel.
Key Features
- 100% marine-grade silicone — will not yellow, shrink, or sag over time
- Remains flexible from −70°F to +480°F (−57°C to +249°C)
- Bonds to fiberglass, plastic, wood, glass, and metal
- Resistant to sunlight, weathering, and most chemicals and solvents
- Suitable for use above and below the waterline
- 10.3 oz. (300 ml.) cartridge — requires a standard caulking gun
Compatible Applications
- Deck hardware bedding and through-hull fitting sealing
- Port lights, hatches, and windshield frame sealing
- Fiberglass-to-metal and fiberglass-to-plastic joints
- Engine compartment and bilge area sealing (chemical and solvent resistant)
- Above- and below-waterline hull repairs and sealing
Parts Desk Insights
Best Use Case: Star Brite Marine Silicone is the go-to when you need a high-temperature-resistant, chemically inert seal — particularly around engine compartments, exhaust fittings, and areas exposed to fuel or solvents where polyurethane sealants may not hold up. For standard deck hardware and port light bedding where a removable or paintable sealant is preferred, a polysulfide compound like BoatLIFE Life-Calk may be a better fit. For finishing the bead after application, the Star Brite Caulk Rite Finishing Tool delivers a clean, professional edge. To remove old sealant before starting, use Star Brite Caulk-Away as the prep step.
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.