My contention on Camaros.org was a) that there was only two blacks available in the plant to paint anything with, the Gloss Tuxedo black, and the 80 percent gloss that went on the firewall, and that b)that the rear was painted following the color coat in the Fisher Blackout booth when the dash top, firewall was painted and as such would have had to have had the same 80% gloss satin paint used on the firewall. However I went back and reread the CRG assembly page:
CRG Camaro Assembly Page
And found:
Discussing the Fisher Paint Process, after body color application, reflow oven but before the blackout booth (firewall painting).
"If the car required Z-28, Z-10, or Z-11 stripes or a black rear end panel or rockers, they were masked and sprayed in the in-line repair booth/oven system after the reflow oven."
So now that it is clear that there was two processes where black paint was being applied (the inline repair booth, and the blackout booth) it would appear that the rear panel, and rockers if applicable should have received Tuxedo black gloss paint. Otherwise everything could have been painted in the blackout booth with the satin paint at one time. This would save time and money, things GM loved.
Seems logical to me from a manufacturing process point of view. Why else would you have two processes. Maybe there are differences between a Norwood car and an LA car, since they had a common GM/Fisher paint booth and did things a little different as far as painting goes.