Help! Front Doors Keep Blistering

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My painter has tried twice to paint front doors. They are 20 years old and oak. He sanded, used Bondo to remove grain, sanded, primed and spray painted. Came back 3 weeks later, sanded new paint off, repeated the process with different primer. Next day, blisters. Any Ideas what to do?

q help front doors keep blistering
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