I am not 100% sure, but I thought those type of riveted aluminum boats use sealant in between the rivet joints. I don know if you run the risk of creating leaks if you use paint strippr on the bottom. I have stripped and painted riveted aluminum airplanes.... not a fun job getting ALL the paint off around rivets/seams. Lots of scrubbing with with brass bristle brushes and multiple applications of aircraft stripper. After all that, I then typically etch the entire airplane with etching solution applied by hand with scotchbright pads, then alodyne it, then epoxy prime then polyurethane paint. This is the BEST way to refinish aluminum IMO.
I am not real sure how you might do this using cheaper paint/primer, but you might look into at least using a self etching primer before topcoating with cheap paint or truck bed lining.
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
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