The invention relates to radiation-curable aqueous composition comprising a high molecular weight ethylenically unsaturated polyurethane obtained from the reaction of a polyisocyanate, at least one hydrophilic compound which is capable to render the polyurethane prepolymer dispersible in aqueous medium, an ethylenically unsaturated compound containing at least two reactive groups capable to react with isocyanate groups and an active hydrogen containing chain extender and a low molecular weight ethylenically unsaturated polyurethane end-capped with an ethylenically unsaturated compound containing essentially one reactive group capable to react with isocyanate groups.