well I checked out your web site. This forum is full of trial and error experiments and thats one of the resons I like it so much. I do know for a fact that many guns have been used but that perticular one has not ( I think ) but I did notice that turbine gun and was tempted but decided NOT.... I hope it all comes together. I will say that acetone versus mineral spirits has been discused way way back. Mineral spirits won, acetone flashed " evaporated " to fast to allow the paint to level out. I distincly remember one guy had great results with rusto paint, mineral spirits and a air sprayer had very good results and virtuly no orange peel. from your test pieces I would say you should be able to get the mix with the right thinner ( MS )and get a smooth finish without all the orange peel