A radiation curable aqueous coating composition comprising: - from 1 to 99 % by weight, relative to the total weight of and, of at least one radiation curable aqueously dispersed polyester resin composition comprising an emulsifier D and the reaction product AC of a hydroxy functional polyester resin A and an olefinically unsaturated compound C which can be radically polymerised and which is attached to the polyester resin backbone by an ester linkage or a urethane linkage, and - from 1 to 99 % by weight, relative to the total weight of and, of at least one other (meth)acrylated compound selected from the group of: water-dispersible compounds; water-soluble compounds; and/or water-compatible compounds that have a weight average molecular weight of at least 450 Dalton as determined by Gel Permeation Chromatography and are different from the reaction product AC, wherein water-dispersible compounds are compounds that are themselves capable of being dispersed or emulsified into water or are compounds to which water can be added to form a stable dispersion having at least 24 hours of shelf stability at 20°C, wherein water-soluble compounds are compounds that permit to form a homogeneous, single phase mixture when they are mixed with water over a concentration range of 5 to 95 weight% of water in the total mass of water and the compound, wherein water-compatible compounds are compounds that in themselves are not water-reducible, but form dispersions or emulsions in water or aqueous solutions in the presence of a suitable emulsifier E, which may be emulsifier D or a different emulsifier, wherein a compound is said to be water-reducible if it forms an aqueous solution, an aqueous emulsion or aqueous dispersion after preparing a homogeneous mixture, having a mass fraction of the compound in the solution, emulsion or dispersion of at least 10 %, and do not show phase separation upon storage at 20 °C and at least 24 hours after the preparation of the mixture. - from 1 to 99 % by weight, relative to the total weight of and, of at least one radiation curable aqueously dispersed polyester resin composition comprising an emulsifier D and the reaction product AC of a hydroxy functional polyester resin A and an olefinically unsaturated compound C which can be radically polymerised and which is attached to the polyester resin backbone by an ester linkage or a urethane linkage, and - from 1 to 99 % by weight, relative to the total weight of and, of at least one other (meth)acrylated compound selected from the group of: water-dispersible compounds; water-soluble compounds; and/or water-compatible compounds that have a weight average molecular weight of at least 450 Dalton as determined by Gel Permeation Chromatography and are different from the reaction product AC, wherein water-dispersible compounds are compounds that are themselves capable of being dispersed or emulsified into water or are compounds to which water can be added to form a stable dispersion having at least 24 hours of shelf stability at 20°C, wherein water-soluble compounds are compounds that permit to form a homogeneous, single phase mixture when they are mixed with water over a concentration range of 5 to 95 weight% of water in the total mass of water and the compound, wherein water-compatible compounds are compounds that in themselves are not water-reducible, but form dispersions or emulsions in water or aqueous solutions in the presence of a suitable emulsifier E, which may be emulsifier D or a different emulsifier, wherein a compound is said to be water-reducible if it forms an aqueous solution, an aqueous emulsion or aqueous dispersion after preparing a homogeneous mixture, having a mass fraction of the compound in the solution, emulsion or dispersion of at least 10 %, and do not show phase separation upon storage at 20 °C and at least 24 hours after the preparation of the mixture.