I've tried this. It depends on the canvas and how well treated and how much paint is on it. If the paint is very thick it doesn't work very well. I used loose unprimed duck canvas and used Acrylic paint that was fairly thin--almost like water colors, with a few exceptions. Behind the canvas was Sonex--not the typical thick stuff, but the thinnest pyramid shaped stuff. Audio Advisor sells this stuff. It worked well for high frequency 1st reflections off the side wall. I have not tried it with acoustic tile, but hopefully my experience will help.
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