It serves as a means of reducing and increasing the absorbency of the substrate, strengthening the substrate and, due to its high alkalinity, protecting the substrate against the development of microorganisms. The preparation is used for priming mineral substrates, such as: concrete, cement boards, cement plasters, mineral and silicate as well as brick and concrete walls indoors. The preparation does not create a barrier hindering the drying of the walls. It prevents the transfer of dirt from the undercoat, eliminates the possibility of spots on the paint. Makes work easier when painting. The preparation has a microbiological protection system that prevents the development of harmful microorganisms, prevents fungus and mold from escaping to the paint surface.