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PMC Flex has been formulated to provide extended working time .Unlike the other versions of PMC(TM), Flex does not completely harden at room temperature. This means it is possible to make rods and sheets for later use and to return to projects several days after getting started to continue working on them. When you are ready to sand or carve Flex, dry the object by heating to 300Â°F for about 20 minutes. Firing and finishing is the same as for all other fine silver clay.