I have talked to my painter and the custom air brush guy who has been doing this custom work for 15+ years. The air brush painter says it is BEST to apply his work over the first clear coat above the PPG basecoat. I am aware that everything has to be done within a limited time frame after the basecoat & first clear coat are applied. I have decided to go with BASF on top of the PPG basecoat. I will need to talk to both PPG and the BASF techs to make sure these two products are compatible. After the first clear coat the air brush work will be completed and then the final top clear coating with BASF will be done. I don't want to run into issues so that is WHY I am researching this now ahead of time. THANKS