Method for multi layer enameling and coating compounds for said method

A process for coating a substrate with a base lacquer layer and a clear topcoat lacquer layer, comprising:

• applying a base lacquer layer onto a substrate,
• applying an uncured clear topcoat lacquer layer onto the base lacquer layer in a wet-on-wet manner,
• exposing the uncured clear topcoat lacquer layer to high-energy radiation to partially cure the clear topcoat lacquer layer, and
• thereafter jointly stoving the base lacquer layer and the clear topcoat lacquer layer,
• wherein the base lacquer layer comprises at least one feature selected from the group consisting of a color and an effect,
• wherein the clear topcoat lacquer layer has a resin solids content including
• 50 wt. % to 98 wt. % of a thermally curable polymer system (A) which is thermally curable by addition reactions, condensation reactions, or both, the system (A) containing substantially no free-radically polymerizable double bonds and substantially no groups capable of reacting in another way with free-radically polymerizable double bonds of system (B), and
• 2 wt. % to 50 wt. % of a free-radical curing polymer system (B) which is curable via high-energy radiation mediated free-radical polymerization of olefinic double bonds, wherein total weight percentages add up to 100 wt. %, and wherein C═C equivalent weight of the resin solids total content from system (A) and system (B) is between 300 and 10,000.