A fast drying, deeply penetrating preparation based on acrylic resins for priming absorbent, mineral building substrates. It strengthens the substrate, reduces and evolves the absorbency of the substrate, binds dust and dust to the substrate, increases the adhesion of adhesive mortars and self-leveling masses. For use on substrates such as plasterboards, gypsum blocks, gypsum plasters, cement and cement-lime plasters, on concrete substrates and cement screeds. Orange color. For indoor and outdoor use.