Just a heads up to all , ALL North American manufactured cars and light trucks using steel have been using a Galvanized product for the past 8 years or so . All body panels are galv, the exception generally being the roof sheet as it subject to little road debris . Most of the unibody structure parts are all Galv , consisting of many different steel grades and coating weights . As far as the paint not adhearing to the zinc coating , this in itself would hold true however a complex primer system is employed by all manufacturers before painting to ensure total paint adhearance . A scratch right through to the base metal will , in most cases not rust as the zinc coating has the ability to create a temporary zinc oxide layer across the wound . The science of this effect is seen on ships , outboards ect. using a sacrifical zinc anode system .