Sikaflex-291, White, General All-Purpose Fast Cure Marine Adhesive and sealant. Polyurethane sealant for Boats, 10.1 fl. oz Cartridge

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.

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.

First tube arrived damaged. Replacement received. They want me to return the damaged product and not sure how to do that since it leaked all over the bottom of the box that had to be thrown out. Waiting for an answer from Amazon.

Wonderful, grippy, but gooey to apply - super great adhesion - but absolutely need humidity such as East or West coast, near water, Great Lakes or humid Georgia. I live in Colorado and it is still gooey on my sailboat - called the company - they said need 50-60% humidity or it won't dry. Used in my bathtub and I had to leave hot steaming water in the tube twice and it adhered perfectly. Otherwise would be 5 stars in a humid climate. 2 stars for Colorado - but it's not chemical reaction for drying - it's reactive to humidity.

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.

Well it pays to pay attention. Bought a tube in October and finally getting around to using it today, Jan 30. Hurricanes slowed me down. Took all the old caulk out of the funnels, taped it off and went to start to re-caulk and lo and behold it’s black! The label pictured does say white but after looking at the tube itself near the label does say black. Now I’ve had to reorder and pay the expedited shipping since it took me 2 hours to tape off the gunnels not to mention the time it took to remove the old stuff and don’t want to leave tape on the fiberglass in the sun to long. Way to go Amazon and Sika!

Just as expected

This is a great product to use on the boat to glue things down. Not like the discolored 5200 this stays white and won't mold