So, do you have chrome rims with surface rust, deep pits or flaking chrome? Or is it painted and rusty rims? It really depends on the level of rust removal you need to do, or how much original surface finish you want to save. Another consideration, and probably more important, is the condition of the inside of the rims. Old tubes and flat tires hold a lot of moisture inside, and the rust through in there can be terribly weakening of the rim making a bunch of work on the outside a wasted effort.