I too am not impressed with Waxoyl/Schutz, as you say, it flakes off anything but a clean metal or pre-painted surface. I took a heavy duty, circular wire brush on my angle grinder to the rear chassis of my 4x4, got it mostly down to bare metal , and gave it 2 coats of some old, green Hammerite I used to paint the kids' swing frame with 20 years ago! Hammerite washes clean very easily, so you can quickly see if it has deteriorated or come off, and touch in if needed. I did the wheelarches with black, but defects are less obvious, so not as good.
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