You do

After you cleaned the ceiling and walls, you can proceed to the next stage — the primer. After the primitive layer dries, we put up all the surfaces — otherwise you do not reach a new even surface. Should be putty several times, letting each layer dry. If small flaws arise — it does not matter, everything is easy to fix, all the same indispensable spatula to remove excess (or sandpaper), and fill the formed recesses with a layer of putty.