Hi, after I had the walls in this top level flat plastered, there was a leak in the roof that caused the wall to get wet, thus lasted about 8 weeks of drying and reoccurring. The roof was fixed about 11 weeks ago and we have HD very fine weather during this time. However the top of the wall still looks damp. Could this be stained rater than wet? The attached pictures are from over the past few moths with the top one being today.