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I've gone as far as sanding them with 400grit with a rotary sander, then machine cutting paste and finishing paste. It works but there's a limit to how many times you'll want to do it.
I've seen the you tube videos of guys smothering baths in enamel or similar and letting it dry to great effect but I think close examination would reveal a lot of issues. Maybe not but it looks a bit like tv diy show work.
Has anyone here ever resurfaced a bath? Is it in any way worth the faff?