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Full sets available in both sizes. \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy using Bister on top of almost dry Powertex the heated with a hair dryer, surfaces can be cracked. 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Bister can be mixed with Powertex transparent to make coloured Powertex of your choice, it can be added to water and sprayed onto a project or it can be sprinkled into wet powertex for great effect. 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