I'm decorating and there are rust marks in one corner coming from the galvanised plaster edging bead.

There was water ingress in that corner, but I've re-roofed it last year and I'm now decorating. Would a coat of old gloss paint seal it? Or do any of you guys have any magic tips to prevent the rust showing through? I may resort to dry lining the whole room at some later date, as I want to put in a shower W.C, basin and add a couple of windows in the longterm.
The room is part of an extension 15' square with a flat roof.
Del
P.S I've got the mice out of there now
, they were coming under the pation door which was installed by contractors a few years back, they never caulked under the sill
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