1. Sturdy: This is basically a requirement for all wall decorations to the base of the wall. The base layer is better to be water-resistant putty. Water-resistant putty is resistant to water vapor erosion, has a long service life, and is durable, which can ensure that the wallpaper will not peel due to the base layer.

2. Flatness: For wallpapering, the theoretical requirement for the flatness error of the wall is about 3 mm (what is the flatness error and how to measure it, I made an animation, which is available in the store). If the error exceeds 3 mm, it is easy to cause inability to parquet (for wallpapers that require parquet), and it is easy to cause peeling and warping. In actual operation, there are many stickers with an error of more than 3 mm, but the effect is not all bad, each has its own merits.

3. The water absorption rate of the wall: it can also be said that the dryness of the wall. If the wall is too dry, the floor glue used for pasting the wallpaper will lose water too quickly, resulting in a decrease in the bonding ability, which will easily cause peeling and warping. Generally, this problem does not exist when the basement film is used for the wall. If the base film is not used, it is better to roll a little water on the wall first to see if the water is quickly "eaten" by the wall. If so, roll the wall with clean water first (almost all the walls). Materials are afraid of losing water too quickly, so it is very important to ensure the wettability of the wall as much as possible).