Hi I have used a wine red Matt paint in the kitchen dining room and on a wall in the bedroom. Everywhere is Ok but the bedroom has had a chalky residue appear through the wall. I have recently repainted using a different brand (Delux) in a similar colour thinking that would do the trick. However It's starting to show through again. The house is about 15 years old and its just odd that it is only on this one wall.
Can anybody offer any advice please?