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With single stage I don't think you should have too much trouble its easier than base coat than clear coat. The problem with single stage and metallic is you may see very little metallic afterwards because the paint is very thick. Some paint companies won't mix metallic single stage. I've experienced this in the past. Laying down two stage is not too hard but technique is important. Also the clear coat can be tricky to not get runs and sags. Runs and sags can be carefully cut and buffed. Single stage is fairly simple to use and can be fixed with cut and buff. Single stage with metallic in if will not cut and buff very well. good luck I'm looking forward to seeing your progress. I'm assuming your using urethane.
I was looking back at your pieces and its a good idea to primer the complete piece before painting. Not a good idea to paint over bare bondo and old paint you may see the transition in the finish.
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