| abstract |
The invention is directed to a process for multilayer coating of substrates comprising the following steps: n1. applying a base coat layer of a water-based colour- and/or special effect-imparting base coat composition onto an optionally precoated vehicle substrate, n2. optionally drying or curing the base coat layer obtained in step 1, n3. applying a clear coat layer of a transparent clear coat onto the base coat layer and n4. curing the clear coat layer applied in step 3, optionally together with the base coat layer, wherein the water-based colour- and/or special effect-imparting base coat composition comprises: nA) at least one colour- and/or special effect-imparting pigment, nB) water and optionally organic solvents and conventional coating additives and nC) at least one water-dilutable polyurethane/urea resin with a urethane group content of 80 - 220 mmol/g of solid resin of the polyurethane/urea resin, a urea group content of 20-150 mmol/g of solid resin of the polyurethane/urea resin and a crosslinked fraction of 20-95%, relative to solid resin of the polyurethane/urea resin. |