It's fairly easy, although messy. Clean em' up, smear with ceramic tile mastic, spread burlap over and trim before it sets up. I prefer to use two pieces of burlap, top and bottom, with the overlap right about the waterline. Google it and you'll get a few good tutorials with pics. I like to cover the burlap completely with the mastic and then prime with Kilz before painting with Goldens. Also, use the looser landscaping burlap, it works much better than the tighter woven stuff.
Good Luck!
Gene