I recently purchased a used Optoma HD20 for use in my living room. Right now I just have it projecting on my wall which is white. I am planning on building a screen for it to place above my fireplace and am looking for some help on the best paint to use. My living room is 18x13 with a large opening to the kitchen and large opening to the hallway. I can keep the light down fairly dim but as it is not going to be a dedicated theater room there is always going to be some ambient light. I am planning on putting the projector on a shelf on the wall and the screen above the fireplace will give me a 16' throw give or take a few inches. I am planning on Building a 60" x 107" screen out of foam board. Which paint would give me the best performance in moderate ambient light. Thanks for any help.