Yesterday, 12:54 PM
You pays yer money and takes yer choice - encapsulation coatings are great until they get damaged; once the surface is broken moisture will slowly work its way beneath the paint towards an inevitable outcome. Sacrificial coatings (zinc) will corrode preferentially to the steel even if scratched; but some zinc primers I have come across are easily chipped, and they can be difficult to paint. My chassis was hot zinc sprayed many years ago and still seems pretty solid. I brush a fresh coat of black over it once every couple of decades.