Hi l applied some Ranex rustbuster on a few galvanized silver color steel posts under my house that had a little bit of surface rust on them , but l later read the instructions that Ranex is not supposed to be applied to galvanized steel . l think l read it damages the galvanied coating, is that correct? Is there nothing to worry about or could it have caused some damage, If so what damage could it have done, could the Ranex have stripped away the protective galvanized coating on the posts or even corroded the steel itself . l have noticed some white steaks where l applied the ranex and a slight change is color of the steel. How can l fix it , should l paint the posts with zinc rustguard or galvanized paint, what is the best paint to use