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It's important to distinguish expanded polystyrene (the disposable coffee cup and cooler stuff), and extruded polystyrene, which is what is usually found in pink sheets at Home Depot. You DON"T want the expanded as it is nigh impossible to get anything resembling a smooth finish without huge amounts of filling since it comes apart in thoes nasty little white chunks which stick electrostatically to everything. You DO want the extruded, which is sandable.
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