Dap Plaster of Paris Dry Mix sets in 20-30 minutes and can be painted with any oil or latex-based paint. It is preferred by professionals, artists and hobbyists. When using Plaster of Paris you will need clean cold water, a clean mixing container, putty knife or trowel, and sandpaper or a sponge. Read all instructions and warning before using.Details: Available in multiple sizes 4 lb. covers approximately 2.25 sq. ft. depending on thickness of patch Professional quality for repairs in interior plaster walls and ceilings Paintable with any oil or latex-based paint Plastic tub container