There are many benefits to buying a car cover, especially a good one that's waterproof. If you live by the coast, things are going to rust, no simple way to stop that, short of a zinc hot dip.

I looked at the rust stop gadget, they cite marine data and examples, but as i said, a sacrificial anode on a boat is different than getting rust on panels.

Rust is not corrosion it's oxidization. both destroy metals but not in the same ways. I don't think an electric current ( which has a very resistive path to ground through those big rubber insulators ) is going to affect oxidization. the solution for cars is to have the panels plated in something rust resistant, and don't forget the chassis, since the windshield trim tends to leak and allow rust to form where it won't be seen for a long time.


Are these gadgets why some vehicles trail ground straps, some for radio transmitters, some for CNG safety... since otherwise there isn't a good path to ground. ( I won't get into the mysteries of electrical ground now it's too late )