I loved the shine it produces, but you really need to apply it carefully or it will stain the wheels from the accidental over spray or if you do not completely wipe it off.
Trust me you will see it. You'll notice a yellowish stain that resembles your over spray wipe off marks and it will...
+1 on all the comments. It needs to be redone and blended.
I've had my plastic bumpers done to the point they match the body perfectly as well as other panels in the past.
Most factory/oem painted bumpers are either a shade light or dark.
So it can be done.