before i used that stuff, which costs 20 bucks a can, i would just get some pickup truck bed liner from harbor freight for about a buck a can since it's not gonna work very well just spraying on the inside. i guess it would slow it down some. alternatively, and more expensively, there is some stuff called pro-seal that is used to seal aircraft aluminum fuel tanks, is a 2 part epoxy material, very sticky, very strong. lasts a long long time, completely waterproof. but you need to get some between the skin and the rib and around each rivet hole. or build a shed.
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