I tried POR-15. I scrubbed most of the frame spotless then solvent cleaned it and brushed on 3 coats. Looked good for almost a year, after which the stuff just pulled off in sheets. I think I over prepped the surface because it stuck well to the hard to clean spots. If you go that route, be aware that it can be finicky about prep (both too much & too little).
Be *very* careful if you spray it, it's hardened with isocyanates just like Imron (and other urethanes) so you should have a supplied-air respirator.
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