I only ever brought one car for treatment at Mtrpolitain. After I saw all the holes they drilled AND the rust that started forming around them after a few years, I never went back. They wouldn't cover the cost of repairing (painting) the rust. They ONLY cover cost if rust has eaten through the metal from the inside out....
I noticed of of my neighbours last year working on his old Buick and noticed how nice it still looked after 15 years (I think it's a 92 model). He told me how he does his own treatments. It cost him less and did a better job. So he showed me around the car...It was absolutely RUST-FREE...I couldn't believe it. Not a single spot! And it had never been repainted. So I asked him how he did it. As weird as it may sound, for the last fifteen years, he "Vaselined" the entire surrounding base of chassis every summer (heat makes it "mel" in the metal) using rubber/latex gloves. He then uses WD40 o all accessible areas metal parts. You should see his engine bay. Still looks like the car was built only a couple years back...Anyways, I've been doing it since. Hope it'll work as well for my cars as it did for his over the coming years....
