The Stovebolt Site Forums The Shop Area Paint and Body Shop paint lifting off

I painted my 53 truck myself. I'm not very good at it, but for the most part, I'm satisfied with it, except for the right front fender. I had all of the sheet metal sand blasted to bare metal, and epoxy primer applied. When I applied primer/filler to it, a big blister rose up about the size of a half dollar. I sanded it out over a big sized area, and cleaned it well, and applied primer again. The blister reappeared. So, I sanded it down to bare metal and started from scratch. I applied Kirker epoxy, then urethane sanding primer, then paint, which was PPG shopline urethane enamel. Everything seemed OK, but a few days later the paint started lifting up, about where the original blister was. Then it started cracking and peeling off, in the same general area. I was so discusted that I walked away for several months. Now I'm ready to get back at it, but I don't know where to start. Just to elaborate, I did use a name brand wax & grease remover prior to applying every coat of everything. I was careful to follow directions regarding timing of recoating, etc. I feel that I need to apply a really good sealer this time, after stripping it all down, but I don't know what to use. I always thought that epoxy was a good sealer.

To me the weirdest thing about this is that the problem only showed up on the right front fender. I used the same process on the remainder of the truck, and had no problems. I hate body work, but I especially hate doing it over. Your help will be much appreciated.