An aqueous epoxy resin system ABC comprising an aqueously dispersed epoxyresin A having, on the average, at least one epoxy group per molecule, a water-soluble or water-dispersible curing agent B which comprises the reactionproduct of an amine B1 having at least one primary and at least one secondaryamino group, and an adduct B2 of a polyalkylene ether polyol B21 and anopexide component B22, and aminoplast compound C having a mass fraction of atleast 0.1 % of sulphonate or sulphonic acid groups, a coating composition ABCDfor thick layer applications comprising the aqueous epoxy resin system ABC andat least one particulate filler D selected from the group consisting of talc,mica, quartz, titanium dioxide, aluminium dioxide, calcium carbonate, anddolomite, and a process for coating mineral or concrete based substrates orfloors with such coating compositions.
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