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The white styrofoam is VERY messy when you try to carve it. It comes apart in those little foam balls that stick to everything. with the pink extruded board, the foam is more dense and less messy. The pink foam should not be the sole component of structure but should have some wood support. Another big difference in the foams is the thickness they come in. I think that the thickest I have ever seen white styrofoam is about 1", but you can get the pink foam in 2"+ thick sheets. <br />Reed
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