If condensate appears.

if increased humidity is observed in the room;

if the wall is subjected to spatial deformation;

if the wall freezes;

If condensate appears.

The base for drywall is treated with a primer of deep penetration. If the material does not absorb such a composition, for example, concrete. Then for low -porous surfaces, a special primer is used, on the package of which there is a note — “concrete”.