Curbside Outtake: 1969 Chevrolet C-10 Pickup – What’s With The Bumper? Spray-On Patina?

This fine old Chevy pickup was parked right across from my old Ford at Jerry’s one day recently. Nice patina! But then the bumper caught my eye. Patina?

 

That can’t be natural patine. Way too even and…obvious. The whole point of patina is that it’s uneven.

 

So is this some process, or just a faux finish?