If you like your car, don't bother with a smart repair, as ther is nothing smart about a smart repair. For the simple 'fact' that 9/10 of them have been trained within a week and don't have a clue, also they tend to use 1k lacquer, which is not uv resistant (ultra violet) which means the more it sits in the sun, the more it cracks and dies off, which in return makes it a re-work for a pro to put right. I'm audi approved and my only advise is to take it to someone who uses 2k lacquer (any crash repair centre or Bodyshop who is approved in anyway will use 2k) depending on where the scratch is, it would be a case of just painting the door. I use the simple saying of 'buy cheap buy twice'. If you also want it to be audi approved, take it to someone who uses spies hecker products. Hope this helps.