Cabela's aluminum boat patch
Check out Cabela's for their aluminum boat patch. Its a plastic-like 3M product that melts onto the bottom of the boat. Flip the boat over, sand down the area around the leaky rivet and apply the patch by heating up the area with a blow torch. The patch will melt right onto the metal and cover the leaky rivet. I have an old Alumicraft that had several leaky rivets and cracks. The patch worked great. The web link is very long so I recommend that you go to cabelas.com and search for "boat patch". Costs $6.99 plus shipping.
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