Looks like I need to get me some more lacquer thinner. No sense wasting the automotive thinner used for spraying to clean the guns. I use Acetone in a lot of things, and also used it for thinning the Rustoleum. I guess I didn't thin it enough since I had to boost pressure at the gun to 30 to get a good spray(hence the overspray). If I can find a way to seal the detail gun better, maybe an o-ring for the top will do, then I can spray thinner paints with it without wearing half of it on my hand.