Help to choose DIY paint mix for my screen.

Hello,

i have built a screen and i want to paint it. It is 110 inch diagonal made from black-out roller blind cloth, rubbery side. The room is not big, 5x4 meters, viewing distance is about 3.5 meters, windows can be completely blacked out with the same black out roller blinds. As you can see, the wall is dark red, other 3 walls are dark green. Ceiling is matte white. Projector is a ceiling mounted Benq W1070, calibrated it has 1300 lumens according a review.





I am thinking about using black widow, what you guys think? BTW, im from europe, so i cant buy some paints like you have


Any help appreciated.

I think 50pct of viewing will be completely blacked out, another 50 with diffused sunlight going through very thick fabric on windows, without any real sunlight coming. Cant tell you how bright it is exactly, its dim, but you can easily see everything in the room without projection on.