| abstract |
The invention relates to a multi-layer coating system comprising at least one layer a) comprising a coating composition a) comprising at least one isocyanate-functional compound and at least one thiol-functional compound, and at least one layer b) comprising an aqueous coating composition b), wherein at least one layer a) and at least one layer b) have at least one common layer boundary, and wherein coating composition b) comprises at least 17mmol/kg, calculated on the weight of coating composition b), of a catalyst for the addition reaction of the at least one thiol-functional compound and the at least one isocyanate-functional compound. |