POWAFIX POWA FILLA-PATCHING CEMENT 2KG Powafix Powa Filla is a tough and durable interior and exterior fast drying plaster that can be ready for painting within 4 hours of application.Powafix Powa Filla is a tough and durable interior and exterior fast drying plaster that can be ready for painting within 4 hours of application. Powa Filla is suitable for patching over pipe or cable chasings and deep or large holes in brick masonry and concrete surfaces. Used to set basins toilet bowels repair flooring areas as well as areas requiring heat resistance. Repair paving edges grout and holes in floors.