Ardex Feather Finish drys rapidly and provides a high bond to concrete, plywood, cement/ sand screeds, existing sub-floor smoothing compounds and even existing ceramic tiles without the use of primers. Use Ardex Feather Finish for patching, filling and feather finishing, daywork joints, ridges, gouges, depressions, uneven trowel marks, etc., in the sub-floor, as smoothing joints between staggered plywood sheets. Size: 11kg Coverage: 10m 2 @ 1mm thick,50m 2 as a skim coat