Touching up nicks is tricky, but it can be done. The key is having the right paint. I think some touch up paints have good hardener in them, clean the spot with Prepsol or alcohol then use a tiny brush to dab the paint on, let it dry and then build it up. Once you have a mound and it's hard you can use a very fine nail buffing stick to level the mound and then use some 1000 grit paper wet to carefully sand it a little more. Then you can use correction compound to get it real shiny. But I wouldn't do this on anything larger than 3/16"in diameter. It's starts getting risky beyond that.
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