I'm getting you, but I think that is where we might be understanding this differently, due to the background we're all coming to this from. Most lacquer drum finishes, even (seemingly) deep clears or sparkle finishes are quite thin. I wasn't aware that there were automotive finishes that were even in the realm of being multi-millimeters thick.You haven't sprayed much, or any automotive paint, and definitely not the procedure I am talking about here . . to think it won't add even a fraction of a mil It will add much more than that.