Water-based two-layer coating systems based on urethane, their use and coated substrates with them

The present invention relates to a water-based clear paint for producing a water-based two-layer coating system based on polyurethane, the at least one polyacrylate secondary dispersion with a glass transition temperature of the polyacrylate T Furthermore, the invention relates to a water clear coat and the aqueous basecoat comprehensive water-based two-layer coating system, a method for its preparation, its use for coating a substrate, and coated substrates with it.