All I learn by reading these post is whatever works for one guy, it won't work for the next. About POR's (I'm not a body man or a painter) most body shops around here replace, if possible and only a few sand blast most soda blast.
One soda blast the whole car then theyspray witha filler called RAGE ( They said this will protect the car from rust forever!) they sell big $ cars - my friends that our body experts (my opinion) don't like there work! BUT THEY DO SELL CARS! So i'm still in the dark and I do think that the only way to to keep Mr.Russ Away is to cut him off! Please keep up the great comments!