3M 0817 Marine Grade Silicone Sealant (White, 3-Ounce Tube)

Used this for sealing some fittings on my boat and it worked exactly as expected, no leaks at all and it's held up through sun and water exposure without cracking or pulling away. The cap seals well so the tube doesn't cure between uses which is a huge deal with silicone products since they can dry out fast. Only minor thing is the dispenser cap threads can be a little finicky if you push sideways on them but that's pretty minor overall. Solid marine silicone from a brand you can trust and I'd buy it again.

Needed to seal up around a vhf antenna. Easy to use and easy to clean up.

Entire bottom of the tube blew out. Lost half the tube, went all over. 3M needs to fix the squeeze tube. Lots of reviews showing this being an issue. Stuff ain’t cheap.

Realizing that this is a superior Product to most standard caulk products for a shower and bath, we found this very difficult to squeeze out of the tube. We ended up throwing away the nozzle accessory because forcing the caulk up that narrow Path used all of my strength. We’ll see how it holds up in our shower tub combo

I used this on the RV when replacing a side window to seal between the window frame and fiberglass. It's been about 8 months now and it's yellowing now. still appears to be firmly attached and sealed but disappointed in the loss of white color. Also used it in other various repairs on the RV and dust/dirt loves to stick to it, wipes off usually when washing though.