If it was prep issues, then the paint would not have adhered to the surface. Maybe you'll have better luck that me. Perhaps the biggest issue I had was poor coverage. I would put on a coat or two (there's a few cans) then wet sand with a high grit paper and it would tear through the paint as if I laid down a misting. That repeated until I wised up and just didn't sand it and put down a few layers of clear, then sanded and used their compound.