Anyone applied sythetic sealant to their car? Like Teflon for instance. They say it stays on longer than regular wax. I've read about 5StarShine which is supposed to stay on for up to two years. I'm getting mine coated by the dealer and they are supposed to apply a couple of coats of a Teflon sealant which supposedly will last for about 5 years. Let me know what your opinions are.