Provided is a coating composition comprising at least one hydroxyl-containing compound (A), at least one compound (B1) having at least one silane group of the formula (I) —X—Si—R″xG3-x  (I) with G=identical or different hydrolyzable groups, X=organic radical, more particularly linear and/or branched alkylene or cycloalkylene radical having 1 to 20 carbon atoms, R″=alkyl, cycloalkyl, aryl or aralkyl, it being possible for the carbon chain to be interrupted by nonadjacent oxygen, sulfur or NRa groups, with Ra=alkyl, cycloalkyl, aryl or aralkyl, x=0 to 2, and at least one compound (B2) different from the component (B1) and which is prepared from a linear aliphatic diisocyanate (DI), (B2) comprising uretidone groups and at least 2 isocyanate groups per molecule.