Water-in-water coatings on exterior walls are prone to whitening problems, mainly for the following reasons:
Improper treatment of the base layer: Improper treatment of the base layer, such as sanding, cracks, oil stains and other problems on the wall, will lead to insufficient adhesion between the coating and the base layer, and it is easy to produce whitening.
Coating quality problems: unqualified paint quality, such as impurities in the paint, excessive moisture, etc., will also lead to whitening.
Non-standard construction: Non-standard construction, such as uneven coating and insufficient brushing times, will also lead to whitening.
In view of the above reasons, the following measures can be taken to solve the problem of whitening of water-in-water coatings on exterior walls:
Base treatment: The base treatment should be thorough, clean up the sand, cracks, oil stains and other impurities on the wall, and polish it to ensure that the surface of the base is smooth, dry and free of impurities.
Choose high-quality paints: choose water-in-water paints with qualified quality and high brand reputation.
Standardized construction: construction should be carried out in strict accordance with the paint instructions, and the brushing should be uniform and the number of brushing times should be sufficient.
Specifically, when the base layer is treated, you can first use a shovel to clean up the sand, cracks and other impurities on the wall, and then use sandpaper to polish it to make the wall surface smooth and rough. After sanding, rinse the wall with clean water and wait for the wall to dry before painting.
When purchasing coatings, pay attention to the quality marks of coatings and choose coatings that meet national standards. During construction, it is necessary to pay attention to the proportion of paint, the brushing should be uniform, and the number of brushing should be sufficient.
If the water-in-water paint on the exterior wall has whitened the problem, the following measures can be taken to deal with it:
Slight whitening: You can sandpaper the whitening part and reapply a new coat of paint.
Severe whitening: If whitening is severe, it is necessary to remove all the original paint, and then re-apply the base treatment and painting.
When dealing with the problem of whitening, it is necessary to take corresponding protective measures to prevent the paint from polluting the surrounding environment.