The fine white wall plaster known as plasterers' "gauged stuff" is made as follows. A pure, fat lime is slaked with water and afterwards thinned down to the consistency of cream. It is then left to settle, and the water is allowed to evaporate until the mixture is thick enough to work with a trowel. When wanted for use, add about a quarter of its bulk of plaster-of-Paris, and use rapidly, as the mixture is quick-setting.