Process for the production of a two-coat finish, and nonaqueous coatings suitable for this process

Process for the production of a two-coat finish, comprising the steps of:

• (1) applying a pigmented basecoat to a substrate surface,
• (2) forming a polymer film from the basecoat applied in step (1),
• (3) applying a nonaqueous transparent topcoat to the resulting basecoat layer, which topcoat comprises
• (A) resins selected from the group consisting of synthetic resins containing hydroxyl groups and mixtures thereof,
• (B) resins selected from the group consisting of amino resins and mixtures thereof, and
• (C) compounds selected from the group consisting of blocked polyisocyanates and mixtures thereof, wherein the isocyanate(s) is blocked with a blocking agent I, selected from the group consisting of dialkyl malonates and mixtures thereof and a blocking agent II, which is different from I and is selected from the group consisting of compounds containing active methylene groups, an oxime and mixtures thereof and the ratio of equivalents between the isocyanate groups blocked with (I) and the isocyanate groups blocked with (II) being between 1.0:1.0 and 9.0:1.0,
• and subsequently
• (4) baking together the basecoat layer and topcoat layer.