You have a lot of issues that fight the battle for a good polish or wax job on an original paint GN.
Other Turbo colors such as white don't have these issues.
First, in sunlight certain panels will look different than others example rear spoiler. filler panels cloud up in the garage like some sort of reaction to the air.
Equipment at Flint (Buick City) was old at best and moral among the employees was quite low since many would lose their job since the rear wheel drive platform was shutting down.
I even have a inner memo from 1986 that was not released to the pubic about paint issues on Grand Nationals.
Even ASC when they pulled the 547 from the assembly line had problems finding "suitable" donor cars with at least passable paint to start with....afterall its the exterior paint that your eyes see first.
Adding to the problems is even though these cars were assembled at Flint final assembly was done in Pontiac, Michigan reason the P is in your VIN number. At that location I can't recall what parts but certain exterior parts were painted there...so even the entire exterior was not painted by the same paint guns etc or even at the same time. And as any body shop will tell you black is not easy to apply and have it look "perfect"
I have owned several low mileage cars with original paint that you would swear one side was completely reshot as it looked so bad compared to the other side. Depending on the thickness of the paint wet sanding it is one avenue some owners pursue.
Then you have the chip guard portion at the bottom...if your lucky, it is fairly even on both sides.
So, I am just pointing out why in a good many cases some original paint black Turbo Regals no matter what product you use can only overcome so many possible problems that you may face.
denniskirban@yahoo.com
One reason...I own an original white Turbo-T with all original paint. Less problems.