How do I avoid open seams between wallpaper strips?

Four mistakes when applying a wallpaper can cause the seams to open up after drying, both with paper wallpaper and non-woven wallpaper:

1. Not enough wallpaper paste was used.
2. The wallpaper strips or the wall were not evenly pasted.
3. When wallpapering for the first time one often tends to apply the paste too carefully or too sparingly at the edges when pasting the wallpaper in order to avoid spilling it on the wallpapering table.
4. The wallpaper paste has dried too quickly. This can be a problem especially during the warmer months of the year or in overheated rooms.

Gaping seams can therefore be avoided by pasting the wall or wallpaper thoroughly and evenly and making sure that the seams are not exposed when folding the strips. Fold the sheet from both sides so that there is a separation of about 2/3 to 1/3. The smaller half is then folded over again. Drafts or too much heat in the work area shorten the drying time, so it is recommended that you either heat less or keep the windows closed. If the summer sun heats up your work space, you can extend the drying time by using more paste.

Walls that are barely absorbent, due to excessive primer and undercoats, can also become a problem. If this is the case, the paste behind the wallpaper will dry very slowly. During this drying time, the wallpaper sheet can easily contract slightly, so that small seams become visible.