Review on 3M Marine Sealant 5200 - Black, 3 Ounces - Permanent Bonding and Sealing for Boats and Marine Applications by Lagant Wardrick

Some strong things! Used it to attach fittings to a 40 gallon life fountain. This stuff is mostly part of the good life now. The hardware will break before this thing falls off. To put it mildly, I'm impressed. I was so impressed that I found another use. I had a hatch to access my boat that was leaking. I put some of it around it and now you can think of it as part of my boat and it doesn't leak anymore. I just don't want to be too messy when applying, but if you get it all dirty you can clean it up right away, but once it's dry, good luck because you don't get a chance to get on the floor.