Mundex B is a specially modified water-based polymer emulsion based on special polymer blends. After curing, Mundex B shows strong antimicrobial properties which are exclusively due to hydrophobic interactions of the cured polymer emulsion with the cell membrane of microorganisms. This antimicrobial effect is purely physical/mechanical and not due to chemical or ionic interactions. Chemical and physical properties of the polymer coating have been modelled on the natural structure of microorganisms to the greatest possible extent. Mundex B is free of biocides and nanoparticles.