Add PolyFiber II to liquid polyurethane plastics or rubbers to thicken for brush-on application or to make mold shells. PolyFiber II turns a pourable rubber into a brushable system with any level of thickening desired – thin for a face coat or thicker for subsequent coats. PolyFiber II makes a pourable plastic, such as Easycast or TC808, into a highly versatile, brushable consistency for making lightweight mother moulds or mould jackets. Thickened plastics can also be used to create thin, lightweight, laid-up castings.