“…Therefore, this method can be used, for example, as a supporting optimization of the coating process (spray pressure, temperature, drying speed). In the case of determining the durability of coatings, it would be advisable to additionally support the tests of mechanical properties, especially the scratch hardness or adhesion to the substrate, or additionally measure the gloss of the coatings and prepare photographic documentation [3][4][5][6][7][8][9][10].…”