Coating containing unsaturated polyester resins and vinyl ether

Use of a liquid composition at normal conditions (20 ° C, 1 bar), as a coating agent, wherein the composition contains a) an unsaturated polyester resin consisting of polycarboxylic acids with unsaturated α-olefinic polyols and optionally other compounds compounds b) with vinyl ether groups (abbreviated vinyl ether) c) maleic acid, monoester of maleic acid or maleic acid diester, in which the sum of double bonds of polycarboxylic acids with unsaturated α-olefin of a) and compounds c) to the double bonds of the vinyl ether b) the molar ratio is 1.3: 1 to 0.8: 1.