Well, I was using mineral spirits to thin, when I noticed that the testors fluorescent paints don't thin well with mineral spirits. I bought some testors thinner, and that worked fine for thinning the paint, however neither the thinner or lacquer thinner worked well for cleaning the paint out of the airbrush. Wasn't till I used nail polish remover, that it cleaned well. So I was thinking, if that works, I wonder how well straight acetone would work. Thanks Herb. I probably will use it sparingly based off of your response.