One. What are the causes of the yellowing of wall coverings?
1、The selected adhesive product is substandard.
Poor-quality adhesives can corrode wall fabrics and easily cause discoloration of special inks, affecting the service life and causing yellowing and discoloration.
2、Excessive moisture content in the wall
After the membrane application, moisture continuously leaks from the wall, which, during the drying process, causes the membrane to form numerous capillary pores due to continuous moisture penetration, leading to discoloration and yellowing of the wall fabric.
3、The wall substrate has excessive alkalinity.
If the primer or varnish is applied too thinly or unevenly, it will not form a protective layer on the wall surface, preventing the outward leakage of alkaline substances from the wall. This can corrode the wall fabric, leading to discoloration.
4、Causes related to wall materials
The wall treatment material has not fully dried, preventing the formation of a tight protective film. When applied, it is susceptible to penetration by adhesive liquids and moisture due to the lack of a dense film.
5、Improper construction methods.
During construction, excessive pressure with a hard scraper damaged the waterproof layer on the wall covering, leading to detachment and discoloration.
Two. How to correct the yellowing of wall coverings.
If the discoloration is not caused by stains, but by the various reasons mentioned above, then there is essentially no way to reverse these conditions.
If the yellowish discoloration is not severe and does not affect usability, it can be ignored.
If the discoloration is minor and localized, a temporary covering or masking with paint can be used to conceal it. These are effective remediation methods.
If the discoloration is severe and covers a large area, there is no other option than to remove the affected area and re-prepare the wall surface before applying new wallpaper.