At the very beginning, it is necessary to wash off all the old whitewash from the ceiling with warm water. After that, using a wooden block, you should try to smooth the surface of the ceiling plaster and “cut” with a spatula all the cracks that are observed there.
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Putty, in order to close the cracks, you can prepare yourself. To do this, you need one part of gypsum, two parts of chalk and exactly the same amount of wood glue. Dilute the resulting composition in a ratio of 30-50 grams of this mixture per 1 liter of water. The resulting mixture must be thoroughly mixed before a pasty mass is formed.
After that, hook the resulting mixture with the end of the spatula and smoothly apply it to the crack in the ceiling at the beginning across, and then along. The crack must be fully filled with the composition.
Next, the ceiling should be covered with a liquid primer. For such purposes, it is recommended to use soapy primer, which can also be prepared by yourself: 200 grams of laundry soap must be dissolved in 2 liters of boiling water, add 50-100 grams of 55% of olifa, 3 kg of bastard lime and mixed until thick homogeneous mass. Then this mixture must dilute 12 liters of warm water until the mixture is obtained, which resembles a jelly. The mixture should be filtered through a sieve so that there are no lumps.