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Hi Pertabolis,
Actually acetone won't dissolve polyurethane foam or model board. Polyestyrene foam (like Styrofoam or bead-board insulation) is the type of foam that would be dissolved by a strong solvent such as acteone, PU would not really be affected at all.
Regarding the epoxy, that would not be affected by acetone, certainly not over the lengths of time it would take to dissolve away an internal foam core so the process you're describing would be absolutely fine, providing that you use a polystyrene foam core and not a polyurethane one.
Best regards, Matt
Matt Statham
Easy Composites / Carbon Mods - Technical Sales
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