I've used the Ford touch up stick on my car. I've got some whopping great stone chips on my car too, some are actual guages out of the metal on the bonnet which I've covered up to prevent rust etc. Let's just say you can tell I did it but I dont care because my car wont rust!
If you are confident with some wet & dry sandpaper then yes you can do it on the cheap but I'm not.
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24/03/05 to 27/06/12 & I loved it