3M Marine Adhesive Sealant 5200 (06504) Permanent Bonding and Sealing for Boats and RVs Above and Below the Waterline Waterproof Repair, Black, 10 fl oz Cartridge

3M Marine 5200 is very much a marine industry standard -- for a reason. It does what it does very well, but don't order this unless you know exactly what that is. It's a "sealant" that takes a full 48 hours to cure... and once it does cure, congratulations, whatever you used it on better be something you want to stay put forever-ish.It's also a "use it or lose it" $20 tube. Open it -- and consider anything you leave in the tube as toast. You're not just going to stick a nail in the tip like it's RTV and use it later. It's also fussy about how you prep the mating surfaces. Acetone? Perfect. Alcohol? Congrats, it will never set. Never. READ THE LABEL.

This adhesive is crazy. I wouldn't use it on anything you do not want to be PERMANENT. We replaced our propane fridge in the RV with a Residential fridge. I used this adhesive to glue metal L brackets to the top, and small Wood spacers on the bottom. It took forever to cure (7 days..) but it is NOT coming off. In retrospect, I think I should have bought the "fast cure" version.

Very good

Be careful what you put this on. It will never let it go. I love the fact that it still flexes after it dries as I use it to patch up hunting waders.

Great product in the tube, hard to apply without the tip. Need the product in the morning so no time to return or order a replacement. Will make do.

I used this sealant for the cab lights on my 2019 F250 and I have had no issues so far.

I used this to seal under the stone around the periphery of my pool, and it worked great for that purpose. I liked that it was also sealed on the non tip end to prevent premature drying of the tube.

Unfortunately, I had to rate this with something.. and there are no negative numbers. I was dumfounded that this product demonstrated 100% failure to do anything it is advertised to do..even for the simplest of use. It failed as an adhesive... and where it would NOT bond it failed to seal. I swim 2.5 - 3 miles everyday and am in the water for anywhere from 80 to 110 minutes non-stop. I customize the swimming goggles I use because I can't find goggles that won't put ring marks on my boney eye sockets and over that kind of time they begin to really hurt. I glue custom cut pieces of an old wet suit to the soft material around the goggle lenses. I read many reviews of this product and bought it because I thought I had found a winner and I'd finally found something that would last... but that was not the case. Within one week the bond failed completely. Now maybe the glue isn't made to withstand chlorine, I don't know.. it wasn't indicated and if it is a marine sealant who's to say someone wouldn't be using it around a pool? It only makes sense it could be. And I might be wrong but it seems the silicone pads on the goggles and rubber wetsuit material would bond (that is to say "melt" together) but what I got was a nice clean surface on both the pieces when they came apart. I put the glue on both surfaces and waited over an hour for it to get sticky (otherwise it was like water), so maybe it doesn't bond to itself. Seems every glue I've ever used recommends doing this. I weighted the bond down overnight and because of the "dry" time, did not get them wet for over a week. I can't imagine using this useless stuff on a boat, or any type of motor, or condition where vibration would be constant. And the kind of set up time required the boat would likely sink if I'm trying to seal water out. I'm glad other people got some satisfaction from it, I sure didn't for that piddly little use...and I'd be willing to bet down the road they will all be doing it again. It took well over a week for the glue to become non-sticky. All in all.. I would not recommend anyone buying this stuff for anything unless you just like the smell of it. Sorry 3m but... best go back to the drawing board.. or put some information together about how, where, what.. maybe "your" definition of marine...directions for application and something on the literature other than the fear based stuff about getting it in the eyes or swallowing it. I normally would not say anything and just throw the stuff away but it was such utter failure...maybe I can save someone the trouble and time I went through.