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Unfortunately polyester resin, the most common fiberglass resin attacked styrofoam.. You would need a polyurathane foam to avoid this.
Most or all foam cores boards are clad in epoxy resin that will not attack the styrofoam.
You will need to cut the styrofoam with a hot wire cutter as it will not carve or sand well.
So with caution you can use it but with care and increased cost and effort. Styrofoam is used commercially and is often moulded to shape as a blank because of the difficulty in getting a good surface.
As a final word you could try covering the surface to protect it from the cheaper polyester resin, untried idea - possibly several coats of varnish might do the job.
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Posted:Aug 16, 2010
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