White set plaster finish has been the traditional method of finishing internal walls in Australia. White set plaster must be applied over a straight solid back ground therefore internal brick walls need.to be cement rendered first. Painted surfaces can be white set as long as the paint is not flaking off and the surface is prepared properly by your renderer. The actual white set is a mixture of plaster and soaked lime and is usually mixed with an electric drill until you get a workable wet mix. The white set is then applied on to your stable straight wall using a steel trowel and then continuously worked until the plaster is dry and you have a glass like finish.