could anyone advise on preparing very old internal walls please? Presently it has old wallpaper which underneath appears to be black and rather mouldy. I expect it will need a skim over to tidy up the walls. (I don't want to apply lining paper) Sorry - I don't know the terms but it is the old type of wall with slats of wood and some kind of plaster. So I'm guessing the skim and paints may need to be a particular type for the walls to breathe?
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