I think it may be a con?
It is an electrical product that uses an Impressed Current and Sacrificial Anode Technologies in other words it is a 45 volt current passed through 2 Anodes(metal strips) that you attach to the drip rails of the car one at the front and one at the rear.They must be in a place that water will come into contact with them when the car gets wet and it is supposed to cause the Anodes to rust rather than the car by up to 76%

I do not know the Science?but more info can be found at www.ruststoponline.com(but that site may be bias)
Can anyone let me know what you think please?