Agreed. If it's a large enough area to need spraying, best left to a good professional who can blend in the repair. I have had pretty good results with touch in paint though. First clean the chip or scratch with acetone. Use a very fine artists brush rather than the brush in the paint bottle, and gradually build up the metallic paint in the depression, keeping it below the surrounding surface. When fully dry, apply the clear coat using the same method, but build it up just proud of the surrounding paint. Leave it to cure for a couple of days, then gently rub over it with a cloth dampened with acetone and wrapped around an old credit card. The aim is to level the new paint to the surrounding surface. Leave it another couple of days and polish with a mild cutting compound. Meguairs do a good one, which dissolves as it's rubbed in, so you can't cut through the original paint like you might if you were heavy handed with something like T-Cut.