My first A body

you sure that aint bondo? I had a repaint over bondo and the paint did the same thing. Bondo was mixed wrong and never fully cured so the paint had nothing to stick to.
Agree, probly bondo under there. Car is a keeper. I have a 68 fastback, but I would definitely have started my build w/ ur dart.
Toss up--------
51 YR old car, I`d completely rewire it !!