Hi I've got a problem and hope some one can help I have plasterboard wall's it's a new property 3 year's old it has already had paint on before i moved in however the bedroom is quite hot and now i have damp patches over it i have kept a window open to let out the humidity i have tried sugar soap to take the damp patches away however it's come back any idea's how i can get rid of the damp patches and still be able to paint on my wall's with an emulsion any help will be gratefully recieved. I forgot to add the damp patches are not on a outside watll's .