Trunk Undercoating Mystery

[SoCal440GTX]

I was poking around my trunk today and I noticed something very weird. The right side has blue body color painted undercoating sprayed on. The left side and underside of the dutchman panel / package tray has this black looking spray. Did someone spray 2/3 of the trunk sometime in it's life with some kind of protectant?

 

[Kern Dog]

When dealing with cars this old, cars that have had multiple owners....Who knows if one of them stopped off at Pep Boys and bought a few cans of spray-bomb undercoating. Technically, what is in the trunk is known as sound deadener. They used the same stuff in the wheelwells. Undercoating on the floorboards was never painted.

 

[threewood]

The blue has better patina and matches with other parts of the trunk. Is that the original color? My 62 in coral gray was coral gray deadener in the trunk. I think they just spray over it.

 

[SoCal440GTX]

Yes, my car was originally blue.
I noticed that the 1968 Plymouth Belvedere on another thread appears to have similar black applied as well. That car is supposed to be an unmolested survivor. Here are pictures...

 

[SoCal440GTX]

Maybe it's the Ziebart Innercoating...

 

[threewood]

$2401.09!!!!!! I need a time machine!