A single-component, low-viscous liquid consisting of water-dispersed SOKRAT styrene-acrylic polymer, creating a hard transparent polymer water-insoluble film. Reduces and unifies the absorbency of the substrate and increases the adhesion of subsequent layers. Used as a primer under the core penetration and final plaster, facade and interior painting. Also used to increase the adhesion of construction glues, self-leveling material, etc. Diluted in water at a ratio of 1:2 to 1:4.