After the ceiling was whitewashed, it becomes very problematic to paint it. After a certain amount of time, the whitewash will begin to crumble along with the paint. In order for the paint to lie on the whitewashed ceiling and gain a foothold on it, it must be processed with a primer. Preferably in several layers.
In the worst case, you will have to spend your time on such stages of work as cleaning the surface of the ceiling from whitewashing and eliminating small defects in the form of cracks. Only after that it will be possible to start applying paint to the ceiling. It will not be superfluous at leisure to find out what the full cost of the loan is made up, this information may be needed in the future.
To remove whitewashing, the surface of the ceiling should be thoroughly moistened with warm water with the addition of baking soda. After the whitewashing absorbing the liquid, it is completely removed from the surface of the ceiling using a spatula. It should be removed slowly, not large areas, periodically wetting the surface. Small whitewashing residues are removed with a wet sponge. After it is necessary to eliminate minor defects, if there are such. To eliminate them, use putty on a plaster basis, after it dries, clean it with fine sandpaper.
There are also special pastes to remove whitewashing, it significantly accelerate and facilitate this work.
Color the ceiling, starting from the wall, roller.