Aqueous coating composition comprising an epoxy resin-based paint base component

A process for repairing a multicoat paint system having defects, comprising applying a coating composition in the region of the defects, curing the coating composition to produce a cured coating layer and then sanding the cured coating layer, wherein the coating composition is an aqueous two-component coating composition comprising

• (1) an epoxy resin-based paint base component, and
• (2) a polyamine-based curing component,
• wherein the paint base component (1) comprises at least one aqueous dispersion of at least one pigment (P) and/or filler (F) in at least one epoxy resin (E),
• and wherein the at least one epoxy resin (E) has
• (i) a maximum sedimentation rate of not more than 17,500 micrometers per hour (measured in an optical cuvette centrifuge at an acceleration of 2050 g, solids diluted to 30% with water) and a glass transition temperature of less than 0° C. (measured by means of dynamic differential calorimetry, heating rate 10 K/min, 2nd measurement run), or
• (ii) a maximum sedimentation rate of at least 12,500 micrometers per hour and a glass transition temperature of at least 0° C.