Dr. Colourchip is very good, I did a post about it a while back.
http://www.rs246.com/index.php?name=PNp ... highlight=
In answer to your question, will it become unnoticeable – it’s a mater of time and patience. The more layers you build up the more unnoticeable they become. I only did 2 layers on a reasonably deep chip on the bonnet and to the untrained eye you would never know it there. Short of a respray you will never get a perfect finish but this is the closest you can get in my opinion.
Got to admit it is a slightly alarming smearing paint all over you’re pride and joy but the ‘magic’ formula takes all excess paint off other than that in the chips, this is what gives it a far better finish than using a touch up stick. It's so easy to do i would let the Mrs have a go! (It also stands up to a porter cable polisher afterwards.)
I bought a gravel rash kit though only had a few chips and have LOTS left over, Audi paint is pretty stuff so unless you have been rally-crossing recently you could get away with getting a smaller kit.
I also know of a GB happening for this stuff on another forum if you’re interested?