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Discussion Starter · #1 ·
I prepped the tank first by shaking dry wall screws around in it until I thought I’d collapse. I detected very little surface roughening from this, but a little. I just couldn’t do it anymore. Then I dumped a quart of white vinegar in it and sloshed it around thoroughly. I left it in for a few days, sloshing it and turning it to sit on a different spot many times. Then I used a quart of paint prep, same technique. I drained the tank and left it for over a week. It felt completely dry. I could detect no residue at all. It smelled clean, faintly of vinegar. Now, a week after coating the tank, I checked it to find the coating had “ “pimpled “. This is usually a result of surface residue when it happens to paint. I plan on using it anyway, hoping for the best, expecting the worst. Disappointing.
 

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Why not use very coarse/coarse sand paper and acetone to prep the tank, and screws for the areas that cannot be reached.

I too need a permanent solution for this swelling thing, although in my country the percentage of ethanol in gasoline is very low, ~5, and it's not affecting the tank/bike.
 

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Discussion Starter · #3 ·
From what I read before prepping the tank, the screws were what was recommended. I just didn’t have the strength or patience to shake the tank until it was noticeably rough inside. You can’t reach much through the openings, and I wouldn’t want to leave grit in there. The issue, I believe, was the chemical strip part of the prep. Some people used stronger chemicals than I did. I was afraid I’d ruin the paint.
 
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