Polycell Wood Flex Polyfilla has been especially developed for wood. It is flexible, stainable, water-resistant & bonds strongly for all your wood filling tasks. It is ideal for filling cracks & holes in wood. Flexible, stainable & water resistant filler. Specially developed for filling cracks & holes in wood. Creates strong bonds for all wood filling tasks. Surface dry in 1-2 hours (depending on conditions). For doors, skirting boards, stairs & window frames. Use indoors or outdoors.