The thickness of the paint you see on your car is measured in microns, 1 micron is equivalent to one thousandth of a millimetre (1/1000mm). It’s comprised of three layers: Primer, Base Colour Coat and Clear Coat. The most common paintwork.
The first layer applied to the metal panel of a vehicle is primer. Primer is designed to make the panel uniform so as to allow the paint colour to be evenly applied to it. Primer on modern cars is thinner than it used to be owing to advances in panel stamping technology, meaning the panels are being supplied in better, more even condition. As a result primer thickness these days, while varying according to auto manufactures and individual plant operating processes, is usually between 8 microns and 38 microns.