The first step is the destruction of Dirt and Old Paint from the Ceiling. Irregularites that more than millimeters also need to be removed with a spatula, Or Cut Down with A Perforator. To promot the Ceiling from the Penetration of the Fungus, Moisture and Mold, Cover it with a Layer of Primer. The Primer Is Applied with A Roller Or Brush. AFTER that, Dry Putty is Kneaded in Water in Proportions, Which Should Be Indicated OF THE BACK of the PACKAGE. Do not Forget to Buy Workwort.