New to the forum so be gentle. I am converting a game room to ahome theater room. The room is 18'x15'-6"x10' hi and the rear and one adjacent wall is sliding glass doors. I will be installing Coolaroo full coverage fabric shades over the doors. The walls are a dark barn red and the 10' high ceiling is white. I am building my screen from BOC and need to know if I should paint it with only matte white gesso or should I use other pigment with it to achieve a more gray finish? My projector is a Viewsonic Pro8200 which I realize will not have the best blacks so would a slight gray finish help with that? Thanks in advance any replies.