I have gotten mixed opinions on painting blueboard. Some say it needs a skimcoat, some say just use a good primer. When I was buying sheetrock at Home Depot, the guy asked where I was going to use it, and I told him in the basement, and he said then "you need this" and brought me to the blueboard. I really had no intention of buying this, but the guy really recommended it. I have just one sheet hung at this point. I am not sure if I want to hang the rest now.