Abstract: A process and a device for prediction of the thickness of a layer of a coating or paint applied upon an object by dip painting. The paint layer thickness (h) at at least one point on the surface of the object (2) is predicted. A correlation between the paint layer thickness and the current density in the paint layer (3) is empirically determined. Further, a correlation between the specific resistance of the paint layer (3) and the current density in the paint layer (3) is empirically determined. Depending upon the value of the applied voltage, the electrical potential at the point is calculated. The current density, the paint layer thickness and the specific resistance of the paint layer (3) at the point following dip coating are calculated. For this the electrical potential at the point as well as two correlations are employed.