Lidar reflective multilayer coatings with high flop index

A multilayer coating system being present on an optionally pre-coated substrate and comprising at least three coatings layers L1, L2 and L3 being different from one another, namely

• a first coating layer L1 applied over at least a portion of an optionally pre-coated substrate,
• a second coating layer L2 applied over the first coating layer L1, and
• a third top coating layer L3 applied over the second coating layer L2,
• wherein the first coating layer L1 is formed from a primer coating composition and the second coating layer L2 is formed from a basecoat composition different from the primer coating composition,
• wherein
• the primer coating composition comprises as at least one constituent P-A at least one film-forming polymer P-A1, and in case of P-A1 being externally crosslinkable, at least one crosslinking agent P-A2, water and/or one or more organic solvents as constituent(s) P-B, and is free of or essentially free of metal effect pigments, but comprises pigment mixture as at least one constituent P-C comprising at least two kinds of pigments being different from one another, namely at least one organic black or inorganic black pigment P-C1, which is not a carbon black pigment, and which is transparent or substantially transparent to NIR-radiation or which is reflective or substantially reflective to NIR-radiation, and at least one inorganic white pigment P-C2, which is reflective or substantially reflective to NIR-radiation,
• wherein pigment P-C1 is present in the primer coating composition in an amount in a range of from 0.1 to 20.0 wt.-%, based on the total weight of the primer coating composition, and pigment P-C2 is present in the primer coating composition in an amount in a range from 0.2 to 40.0 wt.-%, based on the total weight of the primer coating composition, and the basecoat composition comprises as at least one constituent B-A at least one film-forming polymer B-A1, and in case of B-A1 being externally crosslinkable, at least one crosslinking agent B-A2, water and/or one or more organic solvents as constituent(s) B-B, and at least one effect pigment B-C1, which is a pearlescent or interference pigment, wherein the amount of the at least one pigment B-C1 in the basecoat composition exceeds the amount of any aluminum metal effect pigment(s) B-C2 optionally also present therein.