Although the surface of this material is perfectly flat, it must be specially processed:
1) it is necessary to sparkle all the seams available on drywall, as well as the joints between the sheets;
2) put their putty on the hats of self -tapping screws with which drywall was attached to the wall or to the metal guide. As a rule, specially for drywall there are black steel boobs-self-tapping screws that are not amenable to corrosion. If you used just that, then before applying their putty, they must be painted.
After the putty dries, apply a primer layer. It is worth noting that parquet work must be trusted to professionals. The primer can be any company, but with the condition that it is designed specifically for drywall. So why is a primer needed? It performs a number of functions:
Filling microscopic pores in drywall. This means that the material in the consequence will not draw into itself the glue, which will further be applied.
2) If a primer was applied, then there will not be direct contact of drywall with glue. For example, you decide to remove the annoying wallpapers after a while and in the case when the primer was used this procedure does not cause problems.
After the primer dries, all its irregularities should be cleaned, traces that were left with a spatula and other defects using sandpaper with small grains. Then the dusted dust should be removed with a brush.