Patent ID: 8361558

Claim:
A process for the preparation of an outer clear coat layer of an automotive OEM multi-layer coating comprising the steps: (1) providing precoated automotive substrate to be OEM clear coated, (2) providing a binder component having a solids content of 42 to 50 wt.-% comprising at least one hydroxyl-functional binder and a volatile organic content of 50 to 58 wt.-%, wherein the sum of the at least one hydroxyl-functional binder and the volatile organic content total to 100 wt.-%, (3) providing a polyisocyanate crosslinker component, (4) preparing a two-component polyurethane clear coat composition by static mixing the binder component provided in step (2) and the polyisocyanate crosslinker component provided in step (3), (5) spray-applying the two-component polyurethane clear coat composition on the automotive substrate to be OEM clear coated and (6) thermally curing the clear coat layer applied in step (5), wherein the polyisocyanate crosslinker component has a solids content of 66 to 70 wt.-% and a volatile organic content of 30 to 34 wt.-%, the sum of the solids content and the volatile organic content totals 100 wt.-%, wherein the solids content of the polyisocyanate crosslinker component comprises a free polyisocyanate solids content consisting of 75 to 100 wt.-% of at least one polyisocyanate of the 1,6-hexane diisocyanate isocyanurate type and of 0 to 25 wt.-% of at least one polyisocyanate of the isophorone diisocyanate isocyanurate type, wherein the sum of the wt.-% of the two polyisocyanates totals 100 wt.-%.