If it is free of paintting, it should paste putty firstly; if you need to do the paint, it is recommended to stick mesh, because some small defects should be filled up by the putty when painting the carpentry door, and some doors need to use paint technology. If the putty is pasted, then some paint can also be sprayed on the wall, though it is not a lot, but also need to be addressed
In fact, concrete walls can directly whitewashing, it is not easy to crack because of the integrity of the wall, it can do not stick mesh. This shinkage is only occured in the filling wall through plastering, and now there flexible putty to do whitewash, and then stick mesh (mesh can fitst also be sticked), thus the crack will be reduced.
It is first pasted mesh, pasting the whole wall is the best, but the mesh is usually used for cracking at the joint, the whole crack?resistance of dacron cloth is better. If it is a new house, decoration has better to do patch treatment; if it is second?decoration, the walls are relatively intact, it is not necessary to paste.