I just built a 110" blackout fabric screen (from Joann), using the smooth (light blocking side) facing the PJ ... the fabric is much more AT than I expected.
So for getting more gain from Spandex, I'm curious... what about taking the blackout fabric, or any thin smooth AT fabric, and spraying a very thin layer of silver/pearl then placing it behind a single the Spandex layer? Similar to a mylar layer behind a black screen - except not as extreme and still better for AT.
On the flip-side, I'm not sure that is any better than just using the blackout material itself, or taking the blackout material and spraying the fabric-side (non-smooth side) with a silver/pearl.
Wonder how either would perform?
setup: Kodi, Paradigm-Velodyne-SVS, 120" DIY Spandex Screen, Sony 45ES