In order to prepare a drywall for pasting with wallpaper, you should plunge it. This will allow you to protect drywall from damage and make the walls smooth.
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First you have to smear the docking seam. To do this, you need a special grout, Serpyanka or ribbon for seams and fifteen centimeter spatula.
Dilute a small amount of grout and using a spatula apply it on the seam with a thin layer. Then glue a sickle or tape. And apply another layer of grout on top so that it completely closes the sickle or tape.
After you have shook all the seams, you can proceed to putty. It is necessary to start it, with any one wall. Approaching it, using spatulas, a thin layer of putty. After one wall is completely covered, you can switch to the next wall. And so on until the whole room is covered with a thin layer of putty. After that, you need to let the first layer dry during the day. Following, also, apply the second layer of putty and let it dry again. Then wipe all the irregularities using special grinding paper. And only then apply another layer.
Now you can stick wallpaper, and do not worry about what the next repair, you will damage drywall when you tear them off.