Paint Dry Film Thickness Standards Products · Over the past several decades industrial painting has changed owing to the use of new more durable finishes For example indoor industrial switchgear initially painted using two coats of air dry finishes was later painted using a baked one coat enamel at 1 mil DFT Outdoor switchgear initially painted using three coats of paint were later painted using two coats at a total of 2 mils DFT