I've used "dent wizard" in the past with great success on many vehicles, including an all aluminum A8. They can't fix the chip, but will get rid of the dent, I think it cost me $150. With touch up paint, toothpicks, sandpaper, a DA and careful work I have been able fix chips by cleaning the ship, sanding, filling slowly, sanding down the touch up and polishing out the finish. It's not so easy on metallics and large chips, but it can be done. The local MB dealer here has a "chip doctor" i've watched who uses small insulin needles and touch up to fix chips and does a great job. Google your area and see if you've got these near you, or swing by a local, high end auto dealer and see who they use on their used lots for touch ups.