Coating composition especially for preparing automotive surfacers, comprising an anionically stabilized resin, preferably a condensation product A of a carboxyl group-containing resin A1 and a hydroxyl group-containing resin A2, and a curing agent C, which becomes active even at room temperature or slightly elevated temperature of up to not more than 120° C., and comprises a mixture of an unblocked isocyanate C1 and a hydrophilic partially etherified amino resin C2.