Abstract: The present invention relates to a method for powder coating a plastic or glass article, comprising the steps of forming a polar coating on the plastic or glass article, including the substep of applying a coating composition to the plastic or glass article, wherein the coating composition comprises an organosiloxane having at least two Si—O bonds, water, an organic solvent, and a pH regulator selected from a Brønsted acid, in a catalytic amount, with the proviso that the coating composition contains no electrically conductive additive selected from ionic compounds, metals, (mixed) metal oxides, intermetallic compounds, and conductive carbon, and also the steps of applying a powder coating material to the thus-coated plastic or glass article, and of heating the powder coating material.