I am not the Bumbper repair pro in my company but, I beleive he uses an exacto nife or razer and cuts off the loose stuff, then uses body filler to smooth over the deep stuff and primers and repaints. Many mobile specialist will do this for about 250.00 and it can be done in about an hour and half usually sometime a little more or less depending on damages.
Most of the pros don't advertise so hears the insider scoop if you know someone that works used car lots ask them who does their bumbper or paint touch up. I service dealerships in Portland Oregon and we have teams of guys that have expereince in Bumbpers/Interiors/Touch Up piant my specialty :0). Or if you have aren't shy simply ask to talk with the used car manager and he will tell you who they use for such tings. We are half the price of dealerships. Good Luck and if you need further help let me know maybe I can find someone in you B) r area.