⚓ Seal your adventure with confidence—because your boat deserves the best!
SIKA Sikaflex®-291 is a premium one-component polyurethane marine sealant designed for durable, elastic, and vibration-resistant joints on wood, metal, plastic, and ceramic surfaces. It cures quickly upon moisture exposure, resists water damage including saltwater, fuels, and oils, and offers long-lasting, non-corrosive protection. Packaged in a versatile 3 fl. oz tube compatible with various application guns, it’s the trusted choice for professional-grade marine sealing.
J**F
Holds well, good gap filler.
Used this to fill the seam between the hull and deck. Used an electric calking gun allowing for controlled flow into the seams which were 22ft runs from stern to bow. took two tubes of Silkaflex. While fresh it was easy to use a scraper to push this material deeper into the seam and simple to remove excess leaving a smooth seam level with the deck. It took several days to harden to my satisfaction and in the meantime collected a layer of dust onto its surface. Once painted there is a subtle but clear discoloration showing through the paint. It's a good product but as this was a restoration job on a classic wooden boat I think epoxy would have been a better choice. But, no complaints with how this material works and I'm sure it will hold up for some time as the hull and deck flex a bit with movement and with the natural swelling and shrinking inherent in wood.
R**T
Better than what you get at lowes or homedepot
Ordered multiple tube's only one came the wrong color. I sealed the cracks in a torched hardwood floor and it's beautiful. Perfect and sands smooth
D**N
opinion
good product for general sealing of joints.
L**E
The best marine caulk on the market!
I've purchased so many tubes of this, because it's just so great. I'm working on a campervan conversion and this is the only sealant I use to cover up holes and leaks on the body.
B**Y
Horrible packaging fell apart on use. Total waste.
Came in a ridiculous tube of thin cardboard tube. Have never seen any caulk -- even the cheap stuff -- come so poorly packaged. A little dampness was all it took for the tube to fall apart and burst when I tried to use the product. Total waste.
M**R
Strong
Worked well, though it dries a bit off white
J**N
#1
They don't make a better quality sealant
P**L
I got fast cure
I ordered regular but got fast cure. Was okay for my application. Sika flex is great quality. Just inspect your tube when you get it. 291 comes in regular, fast cure, and LOT (long open time). I've used LOT and it was perfect for a trim price that to a long time to prepare before putting in place. Just make sure you get the tube you need. Inspect upon arrival.
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