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Hello, I have had an on going problem with darks marks that won't seem to go away. These marks are not wet, greasy or even colder than the rest of the wall, you can simply just see them. They were improving and going away but have recently appeared again (Not after rain, just generally cold...

Hello all, I hope you can help. I have had some plastering work done in my attic on the 19th and 20th December. I had a part of the wall taken back to the brick, a salt neutraliser applied to the brick and then a scratch coat applied and left to dry overnight. This was then plastered the...