Both in the production and for the subsequent usage (application) of coating materials the viscosity is almost always of vital importance. Viscosity is generally measured both on raw materials and on finished products when the materials are received and is measured again as necessary before, during and after the different manufacturing processes. 

At the final inspection stage for quality, establishing that the laid down values have been maintained gives an important guide that the coating is to specification. Generally, to enable the coating material to be applied properly it must be of the correct viscosity.