Applying the first coat, sometimes called the “scratch coat” On walls we work from the top down this ensures that the plaster is always pushed into the previous previous application when the trowel is pushed vertically up the wall. It’s best to apply smaller amounts than larger ones and really push the plaster through the gaps – as we said above it’s the mechanical grip of the plaster that is squeezed between the laths that holds it on.
Historic building lime plastering Surrey Sussex