How to deal with the powder on the wall when touched by hand

Touching off the powder on the wall is usually caused by improper base treatment or coating quality issues. This can be solved by reapplying putty, applying reinforcement primer, selecting high-quality topcoat, controlling the humidity of the construction environment, and regular maintenance.

1. Re apply putty

When the original putty layer is severely powdered, it needs to be completely removed and water-resistant putty should be selected for re application. Clean up the floating ash on the base layer before construction, dry the putty and polish it flat to ensure that the base layer is firm. If there are cracks in the wall, they need to be repaired with joint filling gypsum first to avoid secondary detachment.

2. Apply reinforcement primer

After the putty layer is completed, apply a penetrating wall fixing or interface agent to enhance the adhesion of the base layer. Primer can seal the pores of the base layer and prevent the topcoat from being absorbed too much, leading to poor film formation. For walls with strong water absorption, it is recommended to apply two coats of primer.

3. Choose high-quality topcoat

Avoid using low-end latex paint, and choose wall coatings that meet the standard of scrub resistance. Pay attention to the thickness of the paint film during construction, as it is prone to powdering if it is too thin. Roll coating or spray coating should be uniform, and the internal corners should be repaired with a brush to ensure that the overall coverage is complete without omission.

4. Control the construction environment

Construction should not be carried out when the temperature is below 5 ℃ or the humidity exceeds 85%, to avoid slow evaporation of water and affecting film formation. Newly built walls should be thoroughly dried, with a moisture content of less than 10%. Maintain ventilation after construction but avoid strong winds blowing directly to prevent paint film cracking.

5. Regular maintenance

Use a soft cloth to wipe lightly during daily cleaning, and do not use strong acid or alkali cleaning agents. If local powder is found, it should be polished with sandpaper and repainted in a timely manner. If there is a large area of peeling, the cause should be identified and systematically repaired. Pay attention to dehumidification during the rainy season, and regularly ventilate vacant rooms.

When dealing with powder coated walls, it is necessary to first assess the condition of the base layer. Minor powder coating can be repaired locally, while severe peeling is recommended for overall renovation. After construction, keep the wall dry and ventilated to avoid heavy objects hitting or sharp objects scratching. Pay attention to observing changes in the wall surface on a daily basis, regularly inspect concealed areas such as corners and ceilings, and identify problems early to extend the service life of the wall surface. For powdering caused by alkali return, the problem of base leakage needs to be solved first before repairing the surface.