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These are the dark circles. Are they cold spots?, they have appeared on every wall.

It is on all the internal walls including 2 chimney breast walls and even the wall under the staircase, I have had the whole ground floor plaster boarded and skimmed. Do you still think its a damp issue?

Thanks for your help Dec, I will go and buy some tomorrow and give it a go.

Dulux Satinwood is great, its oil based and covers really well, you will only need a small tin aswell, it lasts for ages.

Sorry Joe, new to this forum business, I am just trying to find an answer for this problem. When i knock the plaster on the dark circle it sounds more solid than the rest of the wall,

Peter you were correct, the patched areas are solid sounding when knocking them and the other areas are hollow.

I have recently had some walls & ceilings plasterboarded and skimmed, i left them for a month, when i came back i noticed some dark circles had appeared on the plaster about the size of a football, when i painted over them with 2 mist coats and a topcoat, they still came through the paint, does...

I have recently had some walls plasterboarded and skimmed, I left them to dry for around 4 weeks, when i returned i noticed some football size dark circles on all the walls, I have just given one wall 2 mist coats with white emulsion 50-50 then 75-25, I could still see the marks through that...