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Anyone know what happened here? Sprayed a few parts completely black, and then put clear flat topcoat on them twice, and they came out with these fuzzy gray spots on them. At first I thought the topcoat ate through the paint and was showing the primer, but I was able to rub the spots off of one of the parts, so that gray stuff is the actual topcoat. A different batch I did came out fine, and I did almost the exact same thing (I used testors primer instead of tamiya for those.) Did I get a bad can of topcoat or something?