oil base primer over sealer solves most peeling problems.. provided a proper cure is allowed... the weakest link peels... each layer must bond to the next...heating the paint wont stop peeling issues, it only hardens the paint and makes it more durable( and speeds up the curing process)...simular to heat treating steel.. be sure that each layer has ample cure time.. because off gassing during the cure will cause an insufficiant bond.. 24 hours between each " painting process" normally allows ample cure for a strong bond.. but it all start with the sealer .. as Paul said .. it must be completely dry before you even think about priming it..
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