bluenoser

I live in a very corrosive climate that uses salt on the roads during the winter months (up to 5 months of the year) and rust protection is a must. The dealer says that spray on rust protection will void my rust perforation warranty because it may defeat the factory applied rust protection. I've come across a product called Auto Saver, that appears to be some electronic device that places a charge on the grounded metal and prevents corrosion.
Anyone hear, use or have any related experience with this form of corrosion protection?