A correct paint- or coating thickness is an important parameter in the surface treatment industry. The performance of a coating system is based upon correct application of this system following the paint manufacturers specification sheet. Each layer from primer to topcoat and individual intermediate layers are exactly specified with a minimum and maximum coating thickness. Often both a dry and wet film thickness is specified.
Although the dry film is the leading parameter often the wet film is measured during application in order to give the operator an indication of the applied wet film thickness. Measuring wet film thickness during application identifies the need for immediate correction and adjustment by the applicator The relationship between dry and wet film thickness depends on the volume of solids in the coating. The applied wet film thickness depend on many variables such as the type of coating, application method (air pray, brush, roller, airless spray, electrostatic, tribo gun, etc.), equipment quality, operator, substrate material , the size and shape of the part etc..