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Reply to "? will styrafoam is insulation blue hold plaster"

If you  scar the surface with something like a wire brush it will hold very well.   Another way to etch the surface of any styrofoam  is acetone.  Photos of foam etched with 100% acetone.  You can dilute the acetone with water to make it less aggressive. I find that different foam densities need a different dilution so you must experiment.            j

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Last edited by JohnActon
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