you know, I bought the ding shield from Dent Wizard offered through my local dealer for 500$ for 5 years. I had a ding in my right rear passanger door and they got it out and it looks flawless. They are nation wide and I would recommend. If you are interested I can give you their contact info.
2006 E46 ZCP Mystic Blue M3. 2008 E90 SSII M3. ///M