I don't recall seeing anyone actually gluing fabric to a fiberglass panel. I build a wood frame around which my fabric is stretched, then the linacoustic (fiberglass) is just "friction fit" inside the wood panel.
I bought 10 acoustic wall panels from acousticalsolutions.com (Alphasorb)that have GOM stretched and pulled over. It appears they used something like 3M spray adhesive to attach these.
Be careful, though, they used a very rigid fiberglass sheet, most likely Owens Corning 707 series, which does not bend and can even be routed to create nice beveled edge without needing any special wooden frames.
The "regular" rigid fiberglass panels from Owens Corning, like the 703 or 705 series, are supposedly not as dense/firm and would require a backing and frame to allow fabric to be stretched and attached.
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