Description: ARDEX W 820 SUPERFINISH is a brilliant white, rapid hardening, polymer modified gypsum based compound for filling, smoothing and finishing interior walls and ceilings, in dry areas. Can be applied in thin and thick applications and, with its non-shrink formulation, it is an ideal background to apply paint, wallpaper and other decorative finishes. Use on: Plasterboards Pre-rendered walls Suitable concrete backgrounds Aerated concrete Lightweight blocks Construction boards Filling of joints in plasterboards and prefabricated concrete slabs Plaster