Hello!
I know this is a long shot, but it never hurts to ask....
I spent 30-40 hours on a fuel tank that turned out great, until I put gas in it!
After about a week, some blisters started showing up.  There were 20+pin holes that I first filled with JB weld, than Por-15, then skinned the tank with fiberglass filler, then a high fill primer, than 3 coats of urethane base and 3 coats of clear.  The tank was soaked in Evapo-Rust for two days before the Por-15.  
The Por-15 manufacturer said that I probably applied to thick of a coat and the product was not able to flash and harden properly as I didn't pour out any excess after rolling the tank around.  Por-15 is apparently very difficult to remove at this point, so I think the tank may be man cave art.  
I don't mind dents. All the current ebay stuff is pretty holey.    If anyone has one that is worth the effort, I'd love to buy it! 
Thank you,