Hi 3 coat system using a non hydraulic lime ( putty) scratch coat then allow to carbonated 1 week give or take ,floating coat same both approximately 9/12 mm thick obviously depends on wall being plastered, finishing coat lime putty finish with fine sand two coat lay first on with a wooden float allowed to firm up and payed down with a tight coat , allowed to firm right up then growled up ( you can scour it with a float and water and trowel in the fat leaves a nice finish)