The condition of protective or decorative coatings plays a decisive role in maintaining the quality of a product. The better a coating is adhered to the substrate, the more reliable is the protection. The quality of the adhesion of single or multi layered coatings can be measured by cross-cut-tests. 6 or 11 parallel cuts are made on the substrate with the cross hatch. Subsequently these are crossed by 6 or 11 perpendicular cuts. After brushing off loose coating particles an evaluation is made with the magnifying glass according to refererence pictures in the comparison chart.