An anti-graffiti coating system with a layer thickness of about 100 mm(3) was applied on a cuboid-sized steel sample (3 x3.86x10 mm). The porosity of the intermediate layer and the thickness of the topcoat were detd. The ay. pore vol. was about 1.125.10(6) mu m(3) and thickness of the topcoat was 97.98-103.78 mu m. The X-ray microtomography was recommended for 3D anal. of coatings as it provides valuable information about their porosity.