Even using GOM FR 701, I needed black primer, and two coats of flat black. The material is thin. I used Insulshield and did paint behind similarly as well but only on the screen wall.
Other fabrics, like puzzle 4145 have white batting behind them and are fine. It has a much tighter weave than the FR 701 but is out of the direct light of the projector.
The area around the screen wall is probably the most important area to make sure is properly painted under the material. If you are using a micro-perf, absolutely paint the material behind the screen as well as the bright light / light spill will expose the light colors under the material.
The entire area behind my screen is covered with TS. TS is sufficiently dense such that there was no reason to paint the drywall underneath it. I did paint my screen wall with flat black and covered it with GOM FR701. However, no where else in my theater was it necessary to paint the surfaces under the fabric. Take a look at my website and you'll see what I mean.
Also look at my columns. I covered the speakers in my columns with white polyester batting. I then covered the batting with black GOM FR701. I cannot see the white through the black fabric. And believe me, that fabric is stretched tight.
One thing I did forget to paint the same color as the batting or TS (depending on what was there) is the furing strips. There are a couple that do not have trim over them (near corners) that the color of the wood shows through where the black TS has a nice dark backround to it. You can defiantly see the lighter wood color show up through...so dont forget to paint the furing strips.
A forum community dedicated to home theater owners and enthusiasts. Come join the discussion about home audio/video, TVs, projectors, screens, receivers, speakers, projects, DIY’s, product reviews, accessories, classifieds, and more!