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For all intents and purposes, Gatorboard and the other foamcore variants are reflective and we have used it to fashion reflectors and diffusors.
"A Multi layer composite of extremely dense and durable polystyrene foam that resists crushing and denting. Topping the core are several Thicknesses of plastics, papers and adhesives, creating a moisture-resistant layer that helps form a rigid board that is resistant to bending or warping."
And at $79 per 3/16" x 4' x8' sheet, or $316 per 2" thickness, it is hardly inexpensive.
And unless you simply wanted to use it in an angled manner to deflect reflections - it would not diminish flutter echo at all (as it is not a significant absorber). And there are much less expensive means to do this.
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