RP Screen (already seen other posts, looking for different info)

[Esoteric]

Hey guys, so I always do real projection screens with RP. But I have a client who doesn't want to spend the money for one, so they are trying to find a material that will work. The problem is of course that it is RP so you get a HOT spot from the projector directly behind the screen.

Anyone ever find a good material that works for projection but eliminates the hot spot? Or at least reduces it (with their current material I can see all the way through right into the lamp)? Would choroplast work?