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I am pretty sure this is not damp, but rather a tar bases covering used by a previous owner to stop damp. I was recommended by a painter and decorator to use undercoat to seal the wall, but this substance is leaching through. I would welcome suggestions, but I am now leaning to getting a...

Just added another picture, but it looks like it has been painted on the wall, unless the whole wall was black with damp and they just painted over it. Cheers

Hi All, Posted this message a while ago but didn't get round to any pictures. I have added some pictures into my album which shows the overall view and a close up of what may be the soruce, but from what I have seen, it appears to be due to something painted on the wall perhaps due to damp...

I am not sure whether I have a damp problem or the remains of a former damp problem. There are mottled patches under the paint on a couple of walls. When I scrape the paint/plaster from these spots there is a dark patch on the wall. These appear behind the door, on another internal wall and...