A hardener composition H for an epoxy resin based two-pack coating formulation wherein the hardeners are prepared by reacting a mixture of a blocked amine A4B which has a Schiff base structure >C=N- prepared from amines A4 having from two to twenty-four carbon atoms, and at least one primary amino group, and at least one secondary amino group, and a blocking agent B which is a carbonyl functional compound selected from aldehydes and ketones or mixtures of these, under consumption of the primary amino group, and a fatty acid amidoamine A3F prepared from amines A3 having from two to twenty-four carbon atoms, and at least one primary amino group, and at least one secondary amino group, and a fatty acid F which is an aliphatic linear or branched carboxylic acid having at least one carboxyl group per molecule, or a fat or a fatty oil, both individually or collectively abbreviated as "O", which fat or fatty oil O is substantially a triglyceride F 3 G, i. e. a tri-ester of glycerol G and three molecules of fatty acids F which may be the same in each of the ester bonds, or may be different, under formation of fatty acid amide A3F, and concurrent formation of glycerides of fatty acid F which comprise at least one of a diglyceride F 2 G which is an ester of glycerol G with two molecules of fatty acid F, a monoglyceride F 1 G which is an ester of glycerol G with one molecule of fatty acid F, and glycerol G, or mixtures thereof, with an at least difunctional organic compound C having functional groups that are reactive versus secondary amino groups, to form a mixed addition or condensation product; and wherein the blocking agent B is removed such that primary amino groups are liberated; the hardener composition H comprising - moieties M1 having at least one structural element of formula 1 and - moieties M2 having at least one structural element of formula 2 wherein each of D1 and D2 is, independently of each other, a diyl group of formula 3 where m and all ni are, independently, integer numbers from two to twelve, and i is an integer number of from zero to ten, R 1a, R 1b, R 1c, and R 1d are independently of each other and separately for each m and ni, selected from the group consisting of H, and optionally substituted linear or branched alkyl groups having from one to six carbon atoms, or may form a ring, and Q is a univalent group which is an optionally substituted linear or branched alkyl group or alkenyl group preferably having from five to thirty-nine carbon atoms. the hardener composition H comprising - moieties M1 having at least one structural element of formula 1 and - moieties M2 having at least one structural element of formula 2 - moieties M1 having at least one structural element of formula 1 and - moieties M2 having at least one structural element of formula 2 wherein each of D1 and D2 is, independently of each other, a diyl group of formula 3 where m and all ni are, independently, integer numbers from two to twelve, and i is an integer number of from zero to ten, R 1a, R 1b, R 1c, and R 1d are independently of each other and separately for each m and ni, selected from the group consisting of H, and optionally substituted linear or branched alkyl groups having from one to six carbon atoms, or may form a ring, and