Precautions for construction of real stone paint in rainy season

At this stage, most areas of our country have more rain, and the weather is an important factor affecting the construction effect of real stone paint on external walls.
Therefore, in order not to affect the decorative effect and stable quality of the real stone paint on the exterior wall, the following four points must be known in the rainy weather during the construction of the real stone paint on the exterior wall.

1.

Air-drying time

After the rain, the air is very humid and the moisture content is very high.
Therefore, when the wall is being dried, the drying time in rainy days should be one to two times longer than the usual drying time.
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2.

Grassroots treatment

The putty and wall lining of the wall base layer need to be dried for one day in rainy days.

If these base layer treatments are not done well, problems such as bulging and cracks will soon appear after the top coat is sprayed in the future.

3.

Drying time

The normal wall drying time is about two hours, but if it encounters rain or haze, it should be extended according to the weather conditions, and the wall should be completely dry before construction.

Fourth, delay construction

Generally speaking, the wall temperature is above 5℃, the relative air humidity is not more than 80%, and the wall humidity is less than 10% before construction.

In rainy weather or haze, the humidity in the air is relatively high, and the wall is wetted by rainwater and the moisture content is too high, which will cause bulging, returning to alkali and other maladies.

In the rainy climate, a single wall painted with real stone paint will show a small or a few small areas of light or white that are distinct from other parts.

Especially in the dry season, the place where the rainwater erodes from the downspout is sometimes also Appears white, commonly known as "white appearance".
When the weather is fine or the temperature rises, this "whitening" phenomenon generally disappears slowly.

The following several reasons can cause the "whitening" phenomenon of the real stone paint finish

1.

The primer does not meet the requirements, with high water permeability and high air permeability, or the use of ordinary latex paint to seal the primer instead of the real stone paint special primer, which will cause water vapor in the wall to enter the real stone paint coating.

2.

The wall is not dry enough, the plastering surface is low in density, and the closed primer part is leaked or not densely painted, causing water in the wall to enter the real stone paint coating that has not been completely vitrified.

3.

When the real stone paint is sprayed, the temperature is low, or the air humidity is too high, the degree of drying and vitrification of the coating is low, and the moisture in the coating is too high.

4.

Use of a topcoat that does not meet the requirements, the topcoat has poor water resistance, or there is a lack of brushing during the construction of the topcoat, and the number of brushing times is not good, which causes the intrusion of external moisture and also causes the appearance of whitening.

5.
The real stone paint formulation system has defects and poor water resistance, which not only causes whitening of large areas, but also cracks and falls.

In view of the above reasons, the following measures are recommended to prevent the occurrence of "whitening" of real stone paint finishes

1.
Properly choose the real stone paint series products.
It is recommended to buy products from regular and professional manufacturers, and never use low-priced defective products from non-professional manufacturers.

2.
It is not allowed to use latex paint sealer primer instead of real stone paint sealer.
The functional systems of these two products are different.
The primer of general paint requires certain air permeability, while the special primer for real stone paint has little air permeability and can Most of the water vapor in the wall is isolated.

3.
For walls with poor dryness or uneven dryness, it is advisable to use epoxy series of closed primers, and the painting must be tightly in place, and no paint or paint shall be missed to increase the barrier to moisture in the wall.

4.
During construction, if the surrounding environment simply pollutes the real stone paint, postpone the painting of the top paint as much as possible to increase the degree of dryness and solidification of the real stone paint.