I have an eleven year old eighteen foot round above ground pool. I have approximately five or six dime size rust spots on the exterior walls of the pool. Some of the rust spots are rusted through and I can see the liner. A repair person has said that this can be repaired and should last for many years. His fix will include patching the holes with a metal plate, replace the liner and cover the inside walls with sheet foam. Any idea if this type of repair is safe, I don't want children swimming in the pool and the sides give way.