The thickness of coatings can be measured both dry and wet.
The dry measurement is carried out by means of coating thickness gauges, which are able to measure any insulating layer applied on a metal substrate, such as paint and plastic layers. This type of measuring instrument is able to accurately indicate the thickness of each type of coating or paint present on ferrous (magnetic) and non-ferrous (non-magnetic) metal supports. Measuring principles of coating thickness gauge are those of magnetic induction (for ferrous base coatings) or eddy current (for non-ferrous base coatings). In addition to paint thicknesses measurement, these instruments can measure different types of coatings applied to sub-layers or resulting from galvanic baths such as anodizing, chrome plating, galvanizing, etc.
The wet measurement of a coating is carried out by means of comb-shaped thickness gauges or rolling wheel wet film thickness gauges. This type of instruments is made of metallic material and offers the possibility of measuring coating and varnish layer without waiting for its complete drying.
