Viscosity describes the flow characteristics of a lacquer. Amongst other things, it is dependent upon temperature and solids content. The ideal viscosity of the coating material depends on the application process, the coating equipment and the geometry of the parts that are to be coated. On delivery, the viscosity of the lacquer typically differs from the state during application. It is therefore necessary to bring the viscosity to the application state prior to filling it into the application container. This involves adjusting the desired flow property with a suitable thinner. This results in a dependency between the addition of thinner and viscosity – the greater the amount added, the lower the solids content of the lacquer (see illustration).

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