the BEST way to fix it is to take the piece to a good bodyshop, and make sure they use DuPont, PPG, or Sherwin-Williams paint, and have them repaint it. really, there is no other good way... touchup paint will never match right, so you'll always be able to see it, and yu run the risk with a chip that big, of it spreading. I'd say just pony up the cash, and get it done at a shop!