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In general, only two coats of plaster are needed to have a good result. A base layer and a durable topcoat. However, sometimes a third coat is needed to smooth out any blemishes and imperfections.

Putting plaster on plywood is not a good idea. Plaster is a cement type material and will not stick to anything that has moisture in it. Drywall and PVA are ok because they do not retain moisture. But plaster on plywood can cause dry rot and will be uneven around joins in plywood panels.

Generally, plaster needs a minimum of seven days before paint can be applied. In humid weather or other poor drying conditions, it will take longer. Always check the entire surface before starting to paint to avoid cracking and peeling.

Plaster cannot be directly put onto wood. Metal or wooden paths need to be put on first to give the plaster something to attach to. Expanded Metal Lathing is usually the easiest way to do this. It will be invisible once all the layers of plaster are applied .

Plaster is generally applied in two coats. The base coat is 8mm-10mm thick depending on the surface, and the next layers are about 2mm thick. This makes for a total of 10mm-13mm thick.

Gypsum is preferred for walls because it has a smooth finish and doesn’t crack as easily. Its versatility and longevity makes it ideal for many different applications and is the go to type for plasterers.