SAME HERE!!
my paint guy was like, "well I can try to take that off with something and maybe it has that "black" primer underneath."
But there was no black primer.
What he said he will do is a 4 stage paint job.
Tape the botto part off then paint the top, clear coat it, then paint bottom (black of course) and do some type of soft gloss or something like that.
FYI: I got my bumper straight from a Ford dealership, the parts guy said some bumper come black and some come bluish color
OH WELL