I don't mean to be critical but I am going to add my 2 cents worth here. If you are like most of us who do this as a hobby and do not have a professional grade paint booth, do not cut expenses to the point you are not using a catalyzed paint. It is almost impossible to paint a car dust and bug free in a garage. It is imperative that you be able to color sand and buff the paint when you are done and that requires a catalyzed 2 part system that will be hard enough to buff. That being said, I have had some really bad paint jobs come out of my gun that after being color sanded and buffed were truly beautiful and something I could be really proud of.