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a great product to get into the habit of using over a repair is dura tec "surfacer/primer",spary this over the repaired area,it will fill the pinholes...i use this on almost every repair...
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like he says, primer will fill the tiny air pockets. Sometimes people get air pockets from how they mix up the putty. Try more of a "folding" mixing vs. "whipping" it up in the cup.