1990 Colors, all with clearcoat or not?

[KTM]

My friend own a 1990 ZR1 and he says that there is clearcoat over his car paintjob. Color code is 81 Bright Red. Are all colors clearcoted from factory and if so since when?

 

[Tom73]

Starting in '81 with the Vettes built at Bowling Green and all Vettes since '82 have been basecoat/clearcoat paint jobs.

tom...