For anyone that drives an older car, rust is always a huge concern. Several years ago, most cars were made out of metal and sooner or later, that metal has a tendency to rust, even in fairly good conditions. If something has happened to the paint or the car has been exposed to salt in any capacity, the tendency to rust is accelerated. This can do a real number on a car, even to the point of adversely impacting its overall value. Rust is a process that goes from bad to worse. For any car that is experiencing rust, the process either has to be stopped or it will continue until it eats a hole right through the metal. Therefore, salt on roads is a real problem for older automobiles.