Filltite Rapid Drying Interior Filler is a fine white powder used to produce a smooth, rapid setting paste when mixed with water. It is easy to sand, won’t shrink and is crack resistant. A 20 minute, open working time combined with a fast drying time makes it ideal for anyone who needs to work quickly and efficiently. Can be coated with all types of paint, other fillers for finishing or covered in wallpaper. Can be used on painted surfaces, plaster and plasterboard, bricks and blocks, cement and concrete.