i have painted my grill. It wasnt bad at all, scuff up the plastichrome with something, then a couple layers of adhesion promotor, then a couple layers of color, then a couple layers of clear. actually i painted the big ford emblem black also, looks pretty cool, but since the name ford is kindof raised, even though i have it painted you can still see "ford" when you look at the emblem at the right angle. but. the bad thing is, i am constantly using a cue tip to touch up rock chips, and when i mean chips i just dont mean small ones, but usually you get a dime sized hunk of chrome showing through the black. i'm actually on my 3rd complete respray of the grill because of chips in the paint. if i were you, i would spit out the 50 bucks and go to newfordparts.com and order a black (ebony) grill!!!
If you have any more questions about this, pm me i'll be happy to take pics, or do a write up.