Hi Dave, I am sure Paul is doing things right. His build is cracking.
Kurust is supposed to penetrate the metal, but in my experience, I have at later stages had paint or filler/ paste actually come off the "metal" with a layer of whatever kurust does to the rust stuck to it.
So it was not binding to the metal, rather just coating it I think.
Still have not found any better stuff though, and have used it for donkeys years!
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