How to Touch Up Mouldy Wall Without Repainting the Whole Wall ?

In Hong Kong, when the weather is humid, many people are troubled by mouldy walls. In fact, when walls are invaded by moisture and become mouldy, not only do the wall marks & stains affect the appearance of the home, but it also has a high chance of affecting the health of the homeowner. This is because as long as there is mouldy wall growing, it can be inhaled directly through the air as it circulates. When people inhale these molds, those with lower immunity may experience symptoms such as headaches, fever, skin or mucous membrane inflammation, and even respiratory diseases or allergies. Therefore, it is essential to remove, repair and touch up mouldy wall issues promptly. The following simple steps have been compiled to help touch up mouldy wall situations and avoid being troubled by these issues during this season!

1. Use mold removal products for wall marks & stains
If there are only small mold spots wall marks & stains in specific areas, you can try using mold removal products specifically designed for walls available on the market. By penetrating deeply into the wall, these products can decompose mold at its source while protecting the wall’s color. The general method of use is to aim the mold removal product at the affected wall, spray it evenly, let it sit for about 10 minutes, and then wipe it off with a dry cloth.


2. Touch up with waterproof paint on walls
When you notice that the wall surface is already damp, the quickest method is to carry out waterproofing work on the wall surface, applying waterproof paint or agents to wall cracks or damp areas. First, gently clean the wall surface, then apply the waterproof paint. Applying two separate layers will yield better waterproofing results. After the first layer dries completely, apply the second layer to form a waterproof coating. It usually takes one to two months for damp areas to dry out.


3. Remove damp and mouldy areas
Use a scraper to remove damp and mouldy areas caused by moisture all at once, then sand the surface with sandpaper, gently clean the wall, and repaint the wall to refresh its appearance.

After learning these three methods, you should know what to do when faced with wall marks & stains from mouldy wall issues! To more thoroughly prevent damp and mouldy wall problems, it is recommended to seek the assistance of professional waterproofing and leakage repair experts, properly install waterproof layers on the walls, and add a transparent waterproof film layer during renovations to prevent future water intrusion and damp wall situations.