I was just poking around on AVS trying to find a solution... I am in the process of trying to finish out my home theater. At the last moment, I decided to add Dolby Atmos and put up 4 MartinLogan in-ceiling speakers... I was attempting to hide the speaker locations and came up with the idea of covering the ceiling soffits in Black GOM speaker cloth... I wanter to make it as seamless as possible and decided t cover the entire left soffit as one large run. It turns out to be be about 16' long and about 24" in depth... I came up with what I thought was a really good idea on how to mount the fabric such that is was completely wrinkle free...
It worked like a champ and looked great for several days... However, after about 4 days, the glue started to fail and I have absolutely no idea why... The soffits (ceiling part) was made of MDF... I applied primer on the MDF and after several days, applied some really flat black paint. I wanted to make sure the MDF did not show through the GOM material, which is acoustically transparent so has tiny holes in the fabric... That has been up for maybe 3-4 weeks now and that part of the application worked great... I then applied 3M Super 77 Adhesive, which clearly says is good for fabric. I applied 1/2" staple around the borders of where the fabric meets the walls and where it meets the riser part of the soffit...
All looked fantastic for the first few days and I was ready to start adding the crown molding to hide the staples... That is when I started to notice the fabric is now beginning to sag, as if the glue joint failed... How crap, that was a ton of work to get this wrinkle free, only to have it fail in a matter of days... Is this just an impossible thing I am attempting to do, as in doing such a big piece. Is it that 3M Super 77 just does not work to hold up speaker cloth on ceilings? This has me seriously bummed at the moment and the project is now at a complete stand still...
Matt