On the Slovenian market, there is a wide range of fire protection coatings that reduce the possibility of ignition and the speed of flame spread on the wood surface. The effectiveness of fire protection also depends on the amount of such coatings applied and further surface treatments. In the study, the effect of different coating application rates on the fire protection effectiveness of a water-based transparent coating system for interior wood wall cladding was investigated, taking into account the achievement of the desired visual characteristics of the wood coated in this way. We also investigated the effect of subsequent surface finishing with water-based transparent varnish on the fire protection efficiency of the overall system. At first, the basic properties of all systems were determined, such as gloss, colour, dry film thickness and adhesion. Fire protection performance was tested using the small flame method and the Russian method. All tested systems showed sufficient adhesion, and their final appearance depended on the composition of the coating system. The best fire protection efficiency was achieved when the fire protection coating was applied twice, and it decreased when a transparent water-based varnish was subsequently applied, but to a lesser extent than expected.
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