I have noticed some stores and vehicle dealers selling a product to prevent rust the relies on inducing a current on the metal surfaces of the vehicle.

Can anyone explain how these work and if the are effective?

I'm familiar with catodic protection and sacraficial anodes but this is far beyond my grey cell capacity. [img]/forums/images/icons/grin.gif[/img]

Egon [img]/forums/images/icons/grin.gif[/img]