Seal leaks, seams, portholes, and repairs above or below the waterline once fully cured.
Flexible cured bond helps handle vibration, shock, expansion, and contraction on boats, RVs, and repair jobs.
Bonds to fiberglass, gelcoat, plastic, metal, glass, ceramic, wood, and more.
Color and size options help you match small touchups, visible seams, and larger caulking work.
Cured sealant can be sanded and painted for cleaner finishing.
More Details
Marine sealant and adhesive caulk.
Variants include white 10 oz, white 3 oz, clear 10 oz, clear 3 oz, black 10 oz, black 3 oz, gray 10 oz, gray 3 oz, and brown 10 oz.
10 oz tubes are about 11 to 11.2 inches long; 3 oz tubes are about 6 inches long.
Designed for above and below waterline use once cured.
Bonds to fiberglass, gelcoat, plastic, metal, glass, ceramic, wood, and more.
Flexible bond remains able to bend, expand, and contract after curing.
Cured sealant can be sanded and painted.
Description
Better Boat Marine Sealant and Adhesive Caulk is made for boat, RV, auto, and repair jobs where sealing and adhesion both matter. Use it for leaking seams, portholes, cosmetic repairs, and other spots that need a flexible waterproof seal.
The cured bond is designed to stay flexible and handle movement, vibration, expansion, and contraction. Choose the color and size that fits the repair, from larger 10 oz tubes to select 3 oz options for smaller jobs.
Our Shipping Rates and Speeds
All orders under $60 ship for $6.99
Orders over $60 ship for FREE
You can expect to receive your items in 3 to 7 days in almost all scenarios
90% of orders arrive in 4 days or less
Try our marine sealant adhesive risk free for 30 days. If you are not satisfied, get a full refund.
DIRECTIONS: Before application, ensure surface to treat is completely clean, free from dust and dry. Only use when air temperature is between 40°-104° F. Apply using a pneumatic or hand caulking gun. To open, cut off tip of plastic nozzle, puncture seal and insert tube in desired application gun. Apply to desired surface. Sealant will set within minutes and final cure occurs at 7-10 depending on air temperature and amount used. Allow sealant to fully cure prior to painting. Use mineral spirits to clean-up se
WARNING:
This product can expose you to chemicals including Toluene, which is known to the state of California to cause cancer, and birth defects or other reproductive harm. www.P65Warnings.ca.gov.
Stops Leaks
Seals seams, portholes, hardware, and joints above or below waterline.
Flexible Permanent Bond
Cured seal moves with vibration, shock, and weather changes.
Weatherproof Seal
Stands up to sun, saltwater, freshwater, and harsh marine exposure.
Bonds Many Materials
Adheres to fiberglass, gelcoat, plastic, metal, glass, wood, and more.
Customer Reviews
Frequently Asked Questions
Yes. Better Boat Marine Sealant can be used above and below the waterline once fully cured.
Yes. This marine sealant is silicone-free, sandable, and paintable once cured.
Typical cure time is about 24 hours, but the inside portion can take up to a couple of days to fully cure depending on bead thickness, temperature, and humidity.
Yes, it offers excellent adhesion to most plastics, acrylics, and Plexiglass, making it ideal for sealing windows and hatches.
For the White variant, the sealant is UV-stabilized to resist yellowing and help maintain a bright white appearance over time. This color-specific answer applies to White only; choose Clear, Black, Gray, or Brown if you need a different finish.
For the Clear variant, the sealant is engineered with UV resistance to help stay clear and transparent in sunlight. This answer applies to the Clear color only; other color variants are White, Black, Gray, and Brown.
Yes, the formula is safe for glass, most marine plastics, and metals, making it ideal for windshield and porthole repairs.
This product comes in a 10-fluid-ounce container, which is sufficient for multiple small repairs or one large sealing project.
For the Black variant, the sealant is engineered with UV resistance to help maintain its black color and physical integrity in sunlight. This answer applies to the Black color only; other color variants are White, Clear, Gray, and Brown.
