Thanks Whale, what you have said seems to echo what my OC’s strata manager told me. That they will fix the ceiling but not paint it or fix any other damage, unless it is, as you said, damaged during fixing of the roof. Unfortunately the fact it has got worse due to delays in fixing it and further rain seems irrelevant. Kind of a screwy rule since the only reason it needs repainting (it was painted a year ago) is because it needs repairing because of the leaking roof.
My contents insurer have told me they definitely won’t cover painting it as it is not a fixture but part of the structure. So I guess this is a watershed liability for the owner under strata law.