I really don't know ****. Lol. I just look for the info I need then I just screw with it till it get it as good as I want it. I am blessed to have a 2 car garage and a Mopar wife. I am going to make her shoot her own engine bay on the 66. If she screws it up, we will take it off, sand it, whatever, and she can do it again till she likes the result.