Let me clarify a few things..
Yes, I got the tank from a private individual, but it was in the box, still wrapped in plastic and had been unopened. He had bought two, for him and a friend, his friend had passed, didn't need the second tank obviously, etc.
I inspected the tank when I took it out of the plastic. It was clear that it had never been used or had a petcock installed, etc. I'm confident it had never been so much as used or had a drop of fuel in it.
Secondly, for the type of paint I used. I used Krylon Fusion Camouflage spray paint. Nothing fancy or ridiculous. Plain ol' spraypaint made for plastic.
Who knows. Just an odd failure I guess. I can't explain it. It wasn't bolted down in a way that would force it down. The only weight at that point was the weight of the fuel. *shrug*
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