Help with clean coat thickness

[tintin]

Hi I bought audi a4 b7 black now these a lot swirl mark all over car I was going to buy paint thickness tester before I buff the car but paint tester only show total mount of paint on car no just clear coat what would be guide figure for clear coat on cars

[Tim909]

Generally speaking, most modern cars with factory paint have a clear coat between 1.0 - 2.0mils (about as thin as a post-it note). A Maximum of .5 mils can be removed. Remove any more than .5 mils and you risk going through your clear coat.