I have been using a rust converting product. Every spring I pull the door mouldings, clean them out and paint this rust converter on the bottom of the doors. I also have some rust on the seams of the doors. I think at sometime in the future I will have to replace the door skin or the door itself on the right front, as this is the worst of all four of my doors. I have seen a few park avenues with the right door replaced. The rust converting product is only slowing down the process....not stopping it.