An aqueous resin dispersion comprising a resin component comprising at least one di- and/or polyfunctional monomeric primary and/or secondary amine and polyfunctional polymeric organic amines having primary and/or secondary amino groups, wherein the resin component has an NH equivalent of 150 to 400 g/mol and a proportion by weight of di- and/or polyfunctional monomeric organic amines of 5% to 150 by weight, and wherein the aqueous dispersion is preparable by a two-stage process (A+B) reacting two starting components (Ia) and (Ib) to give an amino-functional resin mixture having an NH equivalent of 50 to 140 g/mol and a proportion by weight of di- and/or polyfunctional monomeric primary and/or secondary amines of 17.5% to 40% by weight, wherein component (Ia) is an epoxy-functional resin mixture and, in interreacted form, comprises the following components and: = at least one di- and/or multifunctional organic epoxy compound, = at least one compound X-R where X is a functional group reactive toward epoxy groups and R is an organic radical containing polyoxyalkylene units and not containing any further X groups, and component (Ib) comprises at least one di- and/or multifunctional monomeric primary and/or secondary amine, reacting two starting components (IIa) and (IIb) in the aqueous phase to give the resin component, where component (IIa) comprises the amino-functional resin mixture and component (IIb) comprises at least one di- and/or multifunctional organic epoxy compound, where the epoxy compounds used have an average epoxy equivalent weight of less than 400 g/mol, wherein the amines consist to an extent of at least 65 mol% of amines consisting of amino groups and hydrocarbon units. wherein the resin component has an NH equivalent of 150 to 400 g/mol and a proportion by weight of di- and/or polyfunctional monomeric organic amines of 5% to 150 by weight, and wherein the aqueous dispersion is preparable by a two-stage process (A+B) reacting two starting components (Ia) and (Ib) to give an amino-functional resin mixture having an NH equivalent of 50 to 140 g/mol and a proportion by weight of di- and/or polyfunctional monomeric primary and/or secondary amines of 17.5% to 40% by weight, wherein component (Ia) is an epoxy-functional resin mixture and, in interreacted form, comprises the following components and: = at least one di- and/or multifunctional organic epoxy compound, = at least one compound X-R where X is a functional group reactive toward epoxy groups and R is an organic radical containing polyoxyalkylene units and not containing any further X groups, and component (Ib) comprises at least one di- and/or multifunctional monomeric primary and/or secondary amine, reacting two starting components (IIa) and (IIb) in the aqueous phase to give the resin component, where component (IIa) comprises the amino-functional resin mixture and component (IIb) comprises at least one di- and/or multifunctional organic epoxy compound, where the epoxy compounds used have an average epoxy equivalent weight of less than 400 g/mol, reacting two starting components (Ia) and (Ib) to give an amino-functional resin mixture having an NH equivalent of 50 to 140 g/mol and a proportion by weight of di- and/or polyfunctional monomeric primary and/or secondary amines of 17.5% to 40% by weight, wherein component (Ia) is an epoxy-functional resin mixture and, in interreacted form, comprises the following components and: = at least one di- and/or multifunctional organic epoxy compound, = at least one compound X-R where X is a functional group reactive toward epoxy groups and R is an organic radical containing polyoxyalkylene units and not containing any further X groups, and component (Ib) comprises at least one di- and/or multifunctional monomeric primary and/or secondary amine, component (Ia) is an epoxy-functional resin mixture and, in interreacted form, comprises the following components and: = at least one di- and/or multifunctional organic epoxy compound, = at least one compound X-R where X is a functional group reactive toward epoxy groups and R is an organic radical containing polyoxyalkylene units and not containing any further X groups, and = at least one di- and/or multifunctional organic epoxy compound, = at least one compound X-R where X is a functional group reactive toward epoxy groups and R is an organic radical containing polyoxyalkylene units and not containing any further X groups, component (Ib) comprises at least one di- and/or multifunctional monomeric primary and/or secondary amine, reacting two starting components (IIa) and (IIb) in the aqueous phase to give the resin component, where component (IIa) comprises the amino-functional resin mixture and component (IIb) comprises at least one di- and/or multifunctional organic epoxy compound, where the epoxy compounds used have an average epoxy equivalent weight of less than 400 g/mol, component (IIa) comprises the amino-functional resin mixture and component (IIb) comprises at least one di- and/or multifunctional organic epoxy compound, where the epoxy compounds used have an average epoxy equivalent weight of less than 400 g/mol, wherein the amines consist to an extent of at least 65 mol% of amines consisting of amino groups and hydrocarbon units.