"One of the most obvious things that distinguishes polystyrene from other types of foams is that it will be eaten away by many other products, including permanent markers, spray paints, lacquers and fiberglass resin. This is because all of those products contain one or more of the solvents which will dissolve styrene, such as xylene, methyl chloride or liquid styrene. Urethane and polyethylene are not soluable in most of the common solvents, so their foams will stand up to most other prop shop products."

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