This is going to sound really stupid just because of the commercials, but Flex Seal. All the way. I was struggling with keeping up with rust due to the pent house rub issue, even here in coastal San Diego. I tried all sorts of products including rhino liner.
Flex seal literally stopped the rust in its tracks. The other nice thing about it is that I put a bit of vacuum grease on the penthouse rubber gasket and there is no more rub that removes the paint. Flex seal is extremely robust. I did this about 5 years ago, and have not had to have the wire wheel out since.
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2000 EB50 4x4, V10
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