Ltryptophan Not sure if this is what you mean, but they make a paint that is specifically for video screens that will get painted onto a wall. It’s got some sort of little reflective things in it, which makes it different than regular white paint. We used to use it where I used to work, when they wanted to project stuff onto the wall. Like advertisement videos and such. You can get it at theater supply stores, and your local paint store might be able to order some for you.