sealant
I have used a latex sealant on the aluminum cap of my truck and it worked well, I even used it on a sliced area. Clear silicone. If I was going to replace rivits, I would put this around the hole first.
I would think that if you dried the outside bottom of the boat, you could put that substance on that they put on truck bed liners. Its strong and durable, I think that would be worth a shot.
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