A smooth finish is obtained by the use of fine Portland cement mixed neat. As this works " short," it is left a little time till it begins to set; then fresh water is added, and it is beaten up again. This process brings the cement to the state known as " killed," when it sets more slowly, attains a less ultimate strength, and works easier in the running of the mouldings. If this last coat is laid some time after the body of the work has set, it is advisable to wet the surface on which it has to be placed so that the moisture is not drawn out of the finishing coat too quickly.