Had similar [in fact little worse] thing happen at Chuy's [same place where the Bush twins got into trouble
].
Strange but it was the same side and the offender did not leave a note.
I had more black showing through, so obviously buffing was not a solution. I taped around the area and used 200 grit wet sanding paper. After washing and drying I did the following.
Bought a cheap air brush [canister and wand] from Michael's $20.
Bought touch-up bumper paint from Lexus $5~7
Shook the touchup paint well and poured it in a little bottle.
Used the airbrush to spray the paint on.
Layered the paint extremely thin.
Results are acceptable but not perfect. Professional repaint is the only proper fix once the scrape goes past the paint.
Why pay for a new bumper which also has to be painted.
Salim