VIP Auto in Laconia sells pickup truck bed liner coating. It is basically very thick black paint that cleans up with lacquer thinner and makes a thick non-skid protective black surface. It should probably only be used on the dry inside of an aluminum boat hull. I have no idea if it works on the outside that gets wet, but have used it with good results on some loose rivets on the dry inside of a 33 year old 18' aluminum hull. It goes on with a brush or a roller, just like paint and it is expensive.
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