Sikaflex-291 Fast-Cure Marine Adhesive and Sealant, White, 10.1 oz

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.

Works as advertised and is really easy to do. The hardest Part is to get the cover off from the Mirror assembly, but even that was easy. There is not much needed and with a 3 year Shelf life, you have enough left in the tubes to get it done again if needed. Great Product. I would recommend this over fixed gel pads that never will connect to the surfaces as this liquid is doing. Actually there was a gel pad installed before and it failed. That’s why I had to do this in the first place. Definitely recommend this product.

Use these to chalk around swimming pool vents while the water was low. Turned rock hard and still fine after a couple months.

The only thing I’ve found to stop leaks from my hot tub to pool overflow (fiberglass to marble joint).

I love thus stuff i used it to seal the the back door of my septic tank pump truck. Problem Amazon advertises it as 2 day delivery, they changed it to a 4 day delivery, i need this stuff on todsy.

Worked well, though it dries a bit off white

I really really like this adhesive, not as hard as 5200 harder than silicone. I potted down wires with this and the end result was exactly what I wanted.

Each type of caulk has its own purpose and this is not structural quite obviously. I like the fact that It can be above or below the waterline but I would not ever use this below the waterline. As I suspected there are better ways; that said knowing that they don't have a problem with it being underwater makes me feel a lot better about it being above water on my deck. Acting as a sealant.

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Expensive for what size. There are other silicones on the market to look into before purchasing Sika Sikaflex 201.

This is a very good product. It would probably stick to water. D

I bought this Sika 291 to repair an aluminum canoe. This marine urethane is basically the same thing that SportsPal sells in their repair kit. I haven't used it yet but based on other reviews it will be fine for the repair I set out to accomplish Regarding other reviewers stating they received out of date or wrong colour product, I ordered black and got black and the use by date was 9 months into the future (July 2025) beyond my purchase date Nov/2024.

I used this adhesive to bond a sonar transducer to the bottom of a fishing kayak after watching some helpful videos on You Tube, it does as advertised and created a strong bond and there is no signal interference whatsoever.I would suggest bonding and orienting the transducer while the kayak is in the water so you can match the actual depth and the reading on the sonar as it needs to be oriented perfectly.