This may seem a little lazy however G4 was already there and I had two strips of mono to do on a roof so the slater could continue his work, the area was about 10²m and i sprayed it and was done in no time giving me the rest of the day to bead, my point is, once you are used to machine plastering it's not a problem to do small areas without waste of materials and it doesn't take it's toll on the old bones like hand applying.