Metal effect pigment-free radar-compatible coating on a substrate

Radar-compatible coating comprising flake-form effect pigments on a substrate, where the coating is free from metal-effect pigments, characterised in that the coating has at least two layers, in this sequence, on the substrate:

• A) a first layer, which represents a base layer, comprises absorbent pigments and is free from flake-form effect pigments, and
• B) a second layer, which is applied to the first layer and comprises flake-form effect pigments having absorbent properties in an amount of at least 10% by weight, based on the weight of the second layer,
• and where the second layer, when it is applied over the full area of a black/white background in a layer thickness of 14±2 µm and is measured spectrophotometrically in the L*,a*,b* colour space at an illumination angle of 45° and at a viewing angle of 75°, has a colour separation ΔE* between the coated black background and the coated white background in the range from 0 to 20.