[The Newell]

Probably areas that salt roads in the fall-winter-spring, where the salt gets applied to the under carriage, where I've seen car bodys rust out in about 5 years, this is where some sort of coating may be in order. But not many Class A's are being driven in those conditions since many head south in the winter. Remember Salt, Sand an dirt will wear off undercoat. You can get spray cans at Auto-Zone or Walley world to touch it up when needed.

Joseph