If you use enamel, how long do you need to wait before buffing and polishing?
Plus if enamel was used, you can paint enamel over the lacquer based primer system (don't knw how soon you can do it though) but when it came time to blackout the firewall and other areas that might have enamel overspray on them, you can't use the lacquer based blackout paint. Your almost forceing the plant to come up with not only the enamel body color paint, but every other paint that was used on the line had to be enamel. Theres no way that would happen in the plant. It would almost demand that the cars be painted off line somewhere, but as I understand it, theres no place in the plant where you could put 50 some odd cars so they could be stripped down and completely repainted (or painted) in enamel.
The assembly plants were paid based on the number of cars produced, so they would not be to keen on spending alot of extra time on these cars. If it cost them 200 "regular" cars production for a day so they could spend time on these cars, thats probably 3/4 of a million dollars of lost production. I doubt corporate GM is going to give the assembly plant a check for that amount (or anysignificant amount) for spending time painting cars, when the normal paint (lacquer) used would have been more than adequate.