Patent ID: 7968151

Claim:
A process for the production of special effect multi-layer coatings consisting essentially of the successive steps: (1) applying a 10 to 30 μm thick base coat layer onto a substrate provided with an EDC primer, (2) applying a clear coat layer onto the base coat layer, and (3) jointly curing the base coat and clear coat layers to produce said special effect multi-layer coatings; wherein the base coat layer is applied in a first and second layer, wherein the first layer comprises a modified water-borne base coat produced by mixing an unmodified water-borne base coat with an admixture component and the second layer comprises the unmodified water-borne base coat, wherein the unmodified water-borne base coat has a ratio by weight of pigment content to resin solids content of 0.05:1 to 0.6:1, wherein the pigment content of the unmodified water-borne base coat comprises 0.1 to 2 wt. %, relative to the resin solids content of the unmodified water-borne base coat, of at least one metal flake pigment having a thickness of 10 to 80 nm and at least one additional special effect pigment, and wherein the composition of the pigment content is such that UV light transmission through the base coat layer formed of the modified water-borne base coat and unmodified water-borne base coat is less than 0.1 % in the wavelength range of from 290 to 380 nm and less than 0.5 % in the wavelength range of from 380 to 400 nm.