same deal here (solution)
on my aluminum jon-boat...i had scraped the hull so many times
getting stuck out in " hell hole".... also known as A-1
its a flooded section of trees and at "certain times" (water levels) you could get so damn stuck on top of a tree that you'd be out there rocking forever and cursing life.... and be so freakin pissed that you'd wanna get ashore and walk away from your boat and all your gear.... that's how mad it makes you..!
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onto the repair... being that its metal: what i did was to scratch it up real good with a sharp tool (chisel edge) and make a criss cross pattern in the metal or a grid... then i apply a thin layer of bondo
to that area (1/8th to 1/4 of an inch thick) ....and just before it sets up you make the criss cross pattern again in the bondo and let it dry good.
bondo is resin based so fiberglass resin and cloth stick to it very well , but it will just peel off aluminum alone. afterwards you can add some plywood to take the wear instead of grinding off your glass patch... mine hasnt leaked since............
i have repaired gas tanks with this method....too...
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