Filltite Fill & Finish Classic Filler is a fine white powder containing plaster, calcium carbonate, resins, cellulose fibres and special additives to produce a smooth paste when mixed with water. The filler has a moderate, open working time that makes it easy to use for general, interior filling jobs. Fill and Finish will work on all types of interior substrates including painted surfaces, old and new gypsum plaster, plasterboards, plaster blocks, brickwork, cement, concrete, aerated concrete and concrete blocks. The filler is easy to sand, will not shrink, is crack resistant and can be painted after 12 hours.