What is Dry Film Thickness (dft)?

Dry Film Thickness (dft) is the thickness of a coating when dry, expressed in mils. One mil is equal to one thousandth of an inch. 1 mil = .001 inch (1/1000). For comparison purposes, 4 mils is approximately the thickness of one sheet of standard paper. Most black plastic trash bags have a thickness of about 1.5 mil although heavy duty bags may be about 3 mils.