English: An alternative method to dry film measurement which is completed after application and drying of the conformal coating is the wet film technique which allows operators to ensure quality control while the coating is still wet.

Applying too much coating can be expensive. Also wet film measurements are useful for conformal coatings where the dry film thickness can only be measured destructively or over application of conformal coating could be problematic.

The wet film gauges are applied to the wet conformal coating and the teeth indicate the thickness of the conformal coating. The dry film thickness can then be calculated from the measurement based upon the solid resin content of the conformal coating.