A reader recently asked the following question:
"I have at least one loose rivet under my floor somewhere. Is there some product that I can paint on the bottom of my fishing boat (14') that will seal it up and hold up fairly well?"
I don't know of any paint that will hold up well and seal loose rivets. You could smear 3M5200 around the rivets but it would eventually peel off.
Another solution would be to use the new Gougeon Brothers G/Flex epoxy. This is a flexible epoxy with excellent bonding properyies to metals. I would suggest the following:
1. Locate the leaking rivets. Prop the boat up and spray water inside to locate the loose rivets.
2. Dry thoroughly and sand the area around the rivets with 120 grit to remove any paint and provide some "tooth" for the epoxy.
4. Etch the area with WEST 860 Aluminum Etch Kit.
5. Mix and apply a layer of G/Flex epoxy.