Water-based, acrylic adhesion primer, reinforced with fine grain of quartz sand. nhances the coating adhesion on absorbent surfaces. It is used before applying acrylic or acrylic-siloxane plasters, like Top Decor, Gesso, Graffiato type coatings, before puttying visible concrete as well as priming external thermal insulation systems. Suitable for use on previously painted surfaces when it is about to putty them again. It is characterized by very strong adhesion to various medium absorption substrates such as visible concrete, plasterboard, already painted surfaces, by increasing the adhesion between plaster and substrate. It is suitable for interior and exterior use.