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These ecapsulating paints work by (sealing out oxygen)
And factory paint does not ?...(put on in pristine conditions)
When the OEM's start using POR ,or Epoxy(gooey) (and was designed for spraying over trouble finishes ),(I have used them both),then I might be sold ...as you said..."rust never sleeps".....Keep it clean ,(Inside & out),is all that works ...Period
almost 40 years of screwing with rust , start out with.............NO RUST ..then you have a chance ...& a slim one at that .....even , if you are working on something that will never see salt again ...
Even then its a crap shoot....
Any one driving their old restored stuff in the snow?......I doubt it .....