Wet film thicknessWFT

The thickness of a coating measured after it has dried or cured, usually specified per coat and for the complete system. It is a key quality control parameter, checked non-destructively on metal substrates with magnetic induction or eddy current gauges.

A layer of material applied to a substrate to protect it, decorate it or give it specific functional properties. In protective applications the coating is the main barrier against corrosion, weathering, chemical attack and abrasion, and is usually built up as a system of primer, intermediate and finish coats.