Filltite Fill & Finish Rapid-Drying Filler is a fine white powder containing plaster, calcium carbonate, resins, cellulose fibres and special additives to produce a smooth, rapid setting paste when mixed with water. The filler has a short 20 minute, open working time combined with a fast drying time (approximately 4 hours) makes it ideal for professionals who need to work quickly and efficiently. The filler can be coated with all types of paint, other fillers for finishing or covered in wallpaper. This filler can be used on a wide range of new or renovated interior substrates including painted surfaces, old and new gypsum plaster, plasterboards, plaster blocks, brickwork, cement, concrete, aerated concrete and concrete blocks.