So if I were to try and fix it properly, what should I try?
If it spontaneously sprang a leak mid way along the pipe, try and replace the run as far as possible/practical.
If it's corroded you don't want to be doing this again in a week or months time after plastering
Aye that makes sense. I want to help, but don’t want to get in over my head - I have no plumbing experience after all.
@Nef started
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If it spontaneously sprang a leak mid way along the pipe, try and replace the run as far as possible/practical.
If it's corroded you don't want to be doing this again in a week or months time after plastering