Thanks John! so it appears I was mistaking 'the flowcoat primer' for being like the 'gm reconditioning black'...?
Can you provide any other details about the exact type of primer that was? lacquer? enamel? Typically a primer is porous and absorbs moisture over time.... the paint used by GM doesn't seem to be very bad in that sense..?
I've always used the GM Reconditioning black as being the most similar paint I could use (to what was used in the factory), but was it? what would be closer??
It was lacquer primer - don't recall the part number or specs, but in the aftermarket a lot of guys use the GM Reconditioning Black and like it.