My husband and I recently purchased a home that has original knotty pine paneling in most of the rooms. They seems to be sealed with shellac. The walls are beautiful, but I would like to change one of the rooms by painting over the paneling or sanding off the shellac. Can you offer a suggestion on how to remove the shellac, how to sand in the groves or should I just enjoy the walls the way they are. They are just a slight bit dark for my taste. Thanks.