Originally Posted By steve70
Here's an original Hamtramck built 70 Challenger. It looks like some sealer was applied before paint (floor and firewall) but the heavy dark sealer looks like it was applied after

I believe the black sealer was softer and the paint sprayed over it was absorbed into the sealer. There was paint on some parts of the black on cars I had in the 70's. Maybe where it was sprayed heavier.