Been using this product for around 7 years now for coating the rust prone underside areas of my car. The vehicle was already two years old at purchase, but applying this a least once a year kept the corrosion from spreading. It's a Marine Grade product so help greatly with the winter salt mixture on the roads. Driving a new 2017 now, so will very shortly be applying to any rust prone areas BEFORE any road salt has a chance to get a start!