The issue being how thick the paint is. It will be what blocks the light. What I have seen as the best solution is it is machine printed, which allows a thin and even coating.
I agree that your best results will come with experimentation.
Yeah, you REALLLY want to do each paint application "in one
", no going back over or touching up as that will make that area "thicker". The specific treatment we had used in the above mentioned application somewhat fades from my memory but I believe it was simply applied with a hudson sprayer
in a few different layers.
Experienced painters will know the deal from any back-lit drops.
There are a number of materials you can try of course ranging from muslin
to whatever. Everything will take the light from the front and from the back differently, and give you a different resulting look. I wouldn't use RP screen
material as that would be an expensive waste.
Do-Up a few different option samples and shine them from the back with a projector
and with whatever conditions you expect from the front, be that direct or ambient lighting. Use whichever performs best, and the paint/dye treatment you give it will have a different kind of effect
depending on the material itself.