Well, I am from the school of thought which says that preventing any form of rot (of which rust is one) requires free flow of dry air and that any form of injected material will accelerate the rot by trapping existing rust and moisture.
My approach would be to to have the support areas strengthened and treated before rust takes hold. Most people would consider this to be mad but in my view, once rust takes hold it is all downhill.
I had the few areas of superficial rust cut out and removed from the sills of my Omega at 18 years of age. The sills were also inspected internally. With that circa £600 of welding, I am expecting the car's structure to outlast the upper body panels.
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