Hi, First of all, I'm just a diyer, so can someone give me any idea why after I've skimmed a wall with a window in it, the plaster over the skim beads around the recess still look wet. You can still see the shape of the beads in the plaster even though the rest of the wall have completely dried out. The wall was plastered a few months ago but hasn't been painted yet. The plaster was multifinish over plasterboard.