Wallpaper is applied to the walls very easily. As already noted, they can be applied with a pistol — Hopper. Buy such a set will be quite expensive. Basically, it is available only among specialists who are faced with gluing liquid wallpaper quite often. But, it can be rented. Also, apply liquid wallpaper to the walls using a conventional roller. By the way, this type of application of wallpaper is also quite convenient. After you completely decorate the walls with wallpaper, they will dry out only after 72 hours. Therefore, during this time it is not recommended to touch them and feel them. Anyway, the room must be very careful so as not to damage fresh wallpaper. But after their drying out, they are absolutely not afraid of nothing. If you cover such wallpaper on top with varnish, they can even be wiped with a damp cloth or sponge.