I had my bathroom plastered and they filled in a fairly shallow chase where shower pipes used to be on an an external wall. The room died out fairly quickly except these 2 areas. Its been over 4 weeks and the 2 areas dont look any different than they did 2 weeks ago. Im not bothered about waiting but im conserned that there dont seem to be any sign of progress and sometimes it looks like it gets worse. By the evening it looks like its got dryer but then the next morning it looks wetter. Is this normal. Any help?