Process for priming plastic substrates, coating compositions for this purpose, and the use thereof

Process for priming plastic substrates by applying a solvent-borne coating composition and subsequently curing the coating, characterised in that a coating composition is used which is based on

• A) from 10 to 35% by weight of one or more binders having an OH number of from 40 to 150 and obtained by reacting copolymers containing OH groups and built up from (meth)acrylamides, hydroxyalkyl (meth)acrylates and copolymerisable, olefinically unsaturated compounds and having a number average molecular weight (Mn) of from 3,000 to 100,000 and a glass transition temperature of from -20.degree. to +75.degree. C., with polyisocyanates,
• B) from 0 to 20% by weight of further binders,
• C) from 30 to 70% by weight of organic solvents,
• D) from 15 to 45% by weight of pigments and/or fillers,
• E) from 0 to 15% by weight of paint additives, and
• F) from 2 to 20% by weight of a crosslinking agent based on one or more epoxy resins containing at least two epoxide groups per molecule.