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Hi all,
have some galvanised steel railings which were badly painted a few
years ago (e.g. looks like they weren't primed and the gloss paint is
now flaking off)

What's the best way to re-paint them.
Should I just go over them with a sander and put Hammerite on them?
Do you need to be careful how 'deep' the sanding is to protect the
surface layer?

Strip with nitromors back to original plating.
Use correct primer designed for galvanising.
Topcoat in recommended paint from primer manufacturer