Finishing (skimming) with topcoat plaster is an art that takes practice to get a smooth finish. Follow these steps to master the technique of applying finishing plaster.
The technique for applying finishing plaster is the same whether you skim over drywall sheets (as here), render, or undercoat plaster, though the surface preparation varies. An undercoat should be slightly damp when plaster is applied; use a mister to dampen it, if necessary. Practice using plastering techniques on a small area before tackling a whole wall.
Tip: Covering Board
Drywall can be skimmed with plaster to make the surface suitable for painting or papering. Use tape to cover the joints between boards. Apply a layer of plaster across the entire surface. Then follow the steps below to achieve a smooth surface. The same type of plaster should be used for each layer.