Nah my car's not black. I've done black cars with PG before and it didn't finish nicely. In fact, I'm not a big fan of the product at all. Was 4 years ago when i did it on my car and if I still have an Edge green pad, I would try it again (on wife's car, not mine again lol).
End of the day maybe I'm wrong and my memory eludes me in old age. After all you're the pro.