Especially in the outdoor area concrete stone is used very often. Most of the cast stones are already sold pretreated. These plates usually have a silicone-based coating. Due to UV rays and environmental influences, these boards loose their protection after a short time. Therefore we recommend the impregnation with UV resistant Finalit impregnations. Special reports, for example by Prof. Leissen of the University of Cologne, prove the UV resistance and longevity of our products.