Hi, we had our bedroom re-plastered last year using lime, we have used Earthborn paint on it. In the last month or so I have noticed that we have water marks in certain places on the walls. Not damp as such but some of the marks are where we used to have damp patches before we got rid of the original plaster/wallpaper. It looks like I have gone around with a spray mist and sprayed the wall! Have had dehumidifier on for a few days but not a lot of water collected so don't think it's a high moisture content in the room - I do have vents on the windows too. What could be the cause and will they dry up when it's warmer weather again ?