I always felt after 100,000 miles, the undercarriage of my vehicle looked pretty good, abet some surface rust here and there. 6 months ago, I found a spot behind the front driver wheel to be scaling. So I sprayed with Berkebile PFE 2+2(similar to Fluid Film), hoping to prolong the spread and going deeper. Today I was disheartened to find an area was scaling yet. Didn't spread but knocked off scaling. I knocked off some big chunks of scaling and sprayed more of that PFE 2+2 on. So here is my question. Is that area doomed, no matter what I do? Is it possible that those large chunks were forming 6 months ago and the PFE 2+2 could not penetrate to stop it?
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