Rust protection, nowadays, is pretty much a waste of your money, at least according to all of the major resources and experts on the matter. Factory paint has come a long ways from the 70's and 80's, and the simple matter is that cars just don't turn into rustmobiles after 10 years anymore. I know a couple people who work as paint people in body shops and they all say not to bother. Plus, the dealers over-charge for the systems. The only cars I ever see that have any serious rust on them are all 25+ years old.