And concrete contact the day before they start.

The primer is made of mineral salts, alkyds and substances that form a special film on the walls and ceilings. The primer strengthens the supporting surfaces and improves the adhesion of the plaster and walls. There are primers of deep penetration, general purpose and strengthening primers. Depending on the condition of the walls and ceilings, one or another type of primer is used. Walls and ceilings are treated with a primer an hour before the start of work. And concrete contact the day before they start.