Process for the production of a clear top coat layer on automotive bodies

摘要

A process for the production of a clear top coat layer on automotive bodies, characterized in that application of the clear coat comprises the following steps: a) spray application onto at least portions of the precoated surface of the automotive bodies, which portions are not directly accessible to an external observer but are in principle accessible to spray coating, of a clear coat layer from a clear coating composition A curable by free-radical polymerization of olefinic double bonds on exposure to UV radiation, b) spray application onto the outer surface, finished in color-determining manner, of the automotive bodies, which surface is directly accessible to an external observer and to spray coating, of a clear coat layer from a clear coating composition B curable by free-radical polymerization of olefinic double bonds on exposure to UV radiation, and c) curing of the clear coat layer applied from clear coating compositions A and B in process steps a) and b) by means of UV radiation-induced, free-radical polymerization of olefinic double bonds, wherein the clear coating compositions A and B, in each case relative to the resin solids content thereof, differ from one another (1) by clear coating composition A having a higher content of photoinitiator(s) or (2) by clear coating composition A having a lower content of light stabilizer(s) and/or UV absorber(s) or (3) by clear coating composition A having a lower content of light stabilizer(s) and/or UV absorber(s) with clear coating compositions A and B at the same time having a different content of photoinitiator(s).