I would say that it will not be the solution for “ road rash” which presumably is often referred to as gravel rash.
Chipex which provides good results if you have the skill to apply, not quite as easy as the instructions suggest, to isolated stone chips but for wide area degradation I think you will need to have it properly finished by a qualified re-finisher.
Mixed results for me, I bought a kit for my Tungsten Silver Aston Martin and the results on a half a dozen or so isolated stone chips was fantastic, you really can't see them unless you know exactly where they were and study VERY closely, I'm no paint expert but I simply followed the instructions and took my time.
Excited by this I immediately ordered another kit for the XF in Vapour Grey, but this time I have to say I was disappointed by the results, the colour match is poor and to be honest I can do a better job with a normal touch up bottle.
So it seems to depend very much on the colour, and type of paint involved.
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