This is the story of how Michigan Bell Co. solved the problem of rust deterioration in its motor vehicle fleet. Study showed that environmental conditions as well as the salt and chlorides used in highway maintenance were the chief offenders in metal corrosion. The program consists essentially of effective methods in applying a specially prepared commercial compound. It is emphasized that the method of application is just as important as the coating itself. Generous hints derived from experience in testing and trial are offered to potential users.