custom some thing that is not on a paint scale. and something mix by looking at it by dumping pearl in the clear and stuff like air psi thining dry time how many coats of pearl and how many coats of base and try to match if something blows up. if mix by his paint supplier go of it. just trying to cut down on the veriables and tying to keep him away from many coats of stuff and yes there is a fine line from custom and stock stuff