A process for producing color and / or effect paint systems thereof on motor vehicle bodies or parts

A process for preparing color and / or effect coating thereof finishes on motor vehicle bodies or parts, in which administered thereof a pigmented powder coating on the motor vehicle bodies or parts (I), (II) curing the resulting powder coating layer partially or fully, (III) the powder coating film or powder coating overcoated with a solid-color topcoat, a base coat and a clear lacquer or a clearcoat, after which (IV) curing the resulting layers, each alone or together with other layers, wherein the powder coating (A) at least one carboxyl-containing polyester as binder and (B) at least one glycidyl ester of an aromatic or a saturated or unsaturated cycloaliphatic dicarboxylic acid and / or at least one N, N, N ', N'-tetrakis (beta-hydroxyalkyl) -alkandicarbonsaurediamid as a crosslinking agent or (A) at least one hydroxyl-containing polyester as binder and (B) at least one internally blocked uretdione of a diisocyanate as crosslinking agent contains.