1 Fine cracks in the plaster (here is a typical stress crack) can be closed quickly and easily with a joint compound. Typically acrylic or acrylic based, these masses have the advantage, that they can be painted over. They are simply sucked out directly from the cartridge or tube into the, pressed dry crack.
2 To smooth the joint compound you either use your finger, immersed in a concentrated detergent solution, or special spatulas from the hardware store. Should the wall then be painted?, the mass must always be leveled off with a spatula.
3 Will then be wallpapered, you should also apply a self-adhesive tear tape in the event of stress cracks caused by different wall materials.