3M Marine Adhesive Sealant Fast Cure 5200 (05220) Permanent Bonding and Sealing for Boats and RVs Above and Below the Waterline Waterproof Repair, White, 3 fl oz Tube

There is nothing else that comes close. My records show I have purchased it 3 times from Amazon. Slow curing so you have plenty of time to position the part and then use something to hold it in place for 24 hours. Generally considered permanant - you will have to cut the glue seam to remove the part so don't use it on something that might need to be removed years down the road. Strong - you bet. I glued some flat pieces of metal to tubing on my boat. I can stand on these parts with all my weight. Pay attention to the directions - no alcohol cleaning prior to gluing. Can be frozen for longer life span. And NEVER wear good clothes while using this. Nothing will take it out of your clothes if you make a mistake. Use painters tape around the glue area to keep the 5200 off the surrounding area. Keep lots of paper towels near by - it is messy and seems to go everywhere by itself. Uses moisture to cure so can get wet before cured. And finally - guessing here - may be hazzardous to use in a fish tank. Lots of odd chemicals in this stuff.

I used this to attach a stainless steel vent to a resin deck box. I made sure the area of application was clean, put a generous amount of sealant around the brim, and shimmed it in place to make sure it would cure in the correct position. 24 hours later and the vent is stuck fast where I put it. I will definitely be using this stuff again.

Anyone that’s ever worked on Marine/Boats Knows This is the Go To Sealant

Needed an adhesive/sealant to repair roof seam tape. Edges of tape lifted during hurricane Ian. Used this product to glue down seams using a small hard rubber roller. Worked well because cure time is quick. A bit messy to work with in this application but very well worth it. The prospect of replacing the roof tape would have taken days and cost hundreds of dollars. This method only cost me one tube of sealant and about 3 hours.

It works well without wasting a large amount, which is a huge plus!

Good stuff. Messy to work with though

There’s a reason 3m charges so much for not stuff. IT WORKS! I used this to coat some rivets in my Jon boat while I replaced them. No leaks and this stuff seals great! I would recommend wearing gloves and having a rag on standby when using it. It can easily get everywhere.

Stuff is AWESOME !!!! if you own a b oat you need some !