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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...