EN
The paper presents results of mycological tests and accelerated ageing tests for 13 commercially available decorative coatings in relation to costs of their purchase. Mycological tests with the use of A. niger showed that only four preparations protect spruce wood against attack of the test fungus. None of the coatings was resistant to the destructive effect of UV radiation. Testing results of resistance against A. niger attack and accelerated ageing were compared relative to purchase costs of the applied preparations. It was found that the most advantageous preparations were those with medium efficacy and of low prices. However, for the comprehensive economic analysis of the application of tested decorative coatings it is required to consider costs of coating application and surface renovation.