I am doing some work in my 1910's house. In an addition added in the 50's which included a large kitchen and bedroom, there is floor to ceiling and the entire ceilings covered with beadboard. The kitchen is painted the bedroom is bare and a little distressed. I could give it a good cleaning and varnish and it would come out ok, but I'm not too big on beadboard(especially all walls and ceiling) is there a good way to fill in the grooves and smooth it flush to paint? Or might be cheaper to just drywall.