mouldy walls
the sealer you need is called polybond if you paint it on the area (once cleaned and dried) it will stop any marks coming back. as someone already said this depends how bad your walls and ceiling are, you may indeed need to replaster but id try this first.. maybe you should put up some pics to give us a better idea... also the leak that is causing the problem would need fixing... this could be damaged guttering, leak in the roof, plaster render missing from outside walls or if stone then would need sealing on the outside or rendering...
Hope this helps you out.. regards Vagabond
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