A com. available acrylic dispersion was modified by addn. of an ionic liq. (benzalkonium nitrate), a surfactant (ethoxylated lauryl alcohol) and a polyurethane thickener. The stability, surface tension and viscosity of the dispersions obtained, as well as the phys.-mech. properties of the coatings obtained from them (thickness, gloss, adhesion, impact resistance, resistance to tearing and compression test) were detd. The most stable systems and coating with good protective properties were obtained for dispersions containing the ionic liq., surfactant and the polyurethane thickener in amts. of 1, 5 and 0.3 % by mass, resp.