Patent ID: 8877295

Claim:
A process for the production of multi-layer coatings in an A′ color shade on substrates, comprising the successive steps: 1) applying a base coat layer in a total process film thickness in the range from 8 to 20 μm to substrates selected from the group consisting of metal substrates provided with a precoating comprising an external primer surfacer layer, plastics substrates provided with a plastics primer precoating and uncoated plastics substrates, 2) applying a clear coat layer onto the base coat layer, 3) jointly curing the base coat and clear coat layers, wherein the base coat layer is applied in a first layer and in a second layer; the first layer comprises a water-borne base coat AB and the second layer comprises a water-borne base coat A having a color shade A′, wherein the water-borne base coat A is a solid color base coat having a black/white opacity of >25 μm to 80 μm or a special effect base coat having a black/white opacity of >15 μm to 80 μm, wherein the water-borne base coat AB is a mixture of 100 pbv of the water-borne base coat A and 1 to 400 pbv of a water-borne base coat B having a color shade B′, wherein the water-borne base coat B is either a solid color base coat with a black/white opacity of 5 to ≦25 μm or a special effect base coat with a black/white opacity of 5 to ≦15, and wherein the pigment content of the water-borne base coat B is made such that the multi-layer coatings achieved after step 3) achieve color shade consistency from in each case at least 80% of the individual process film thickness both of the layer applied from the water-borne base coat AB and of the layer applied from the water-borne base coat A.