That's not quite correct Kev (on the burned onto the surface part). The idea behind it is that the surface of the wax is "non-stick" and that part is true. It will help dirt and water to slide of as PTFE is very VERY unreactive (don't ask why, unless you want to bored shitless).
But the fact still remains that it is only as good as the bonds to the surface it is covering, which is what Kev was getting at. Sure it will let dirt slide off IT'S surface, but how long will it stick to the paint surface - that's the question and the issue to overcome.