The YSC thread took an interesting turn. I hate dead end threads, so see this quote:
http://www.yenko.net/ubbthreads/ubbthreads.php/topics/640000/69-camaro-bb-blacked-out-panel#Post640000"Again I am pretty protective of the book research but again for the sake of giving you a definitive answer here is a Photo excerpt from the book "Echoes of Norwood" © 2013 Philip Borris and some additional non published research that was not put in the book (but perhaps I should have?)
"The back panel paint was applied on the line between ovens 2 and 3. The paint was the same paint used on the rockers. The gloss difference was a technical result of the temperature differences within the last reflow oven. The first being where the upper portions of the body were exposed to more consistent heat than the rockers and the reflow process was always more glossy in those areas".
"If there was a temperature difference in plant say a summer day- the body was already hot going into the oven - warm to the touch- as opposed to a winter day where the body would be cool to the touch. All of these factors played into the final reflow outcome"
"Cars built in cooler conditions in plant probably were less prone to high gloss where cars that cycled into the oven on a hot day had better and more consistent reflow due to the oven getting a fairly warm body to start with"
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It is my hope that this will put this issue to bed once and for all.
The above is an excerpt of an interview from 6 years ago from the paint Department supervisor who was actually there and can prove he was there.
His name appears on the 1969 personnel listing at Norwood as a Fisher Body employee in paint. In addition He supervised the man in the picture below.
My Guess...
Cars built in the summer glossy
Cars built in the winter less glossy
Spring and Fall split the gloss %
Merry Christmas!! Enjoy."
