The rainy season is coming. Regardless of the construction of internal and external walls, under the conditions of moisture and flooding, we will always encounter the phenomenon of pan-alkali on the wall. The rough surface and the renovated wall surface are okay. Once it becomes pan-alkali, it will be accompanied by various annoying wall symptoms such as discoloration, fading, and flowering of the paint film. To prevent wall problems, it is not enough to do basic treatment and waterproofing. It is also important to match the interior wall supporting system correctly!

Why does the wall break into alkali? This is because the wall is an alkaline material, and the humidity of the substrate itself is too high. The water passing through the wall will bring the alkali in the substrate out of the paint film surface. In severe cases, it will form a layer of alkali frost on the wall. Not only affects the living environment, but also causes annoyance to the residents.

It has become a consensus in the construction process to do a good job in the basic treatment of the wall surface, under the appropriate temperature and humidity environment, and wait for the surface of the putty to dry, but it is not enough. Improper matching of the matching system of the interior wall will also cause a series of wall problems. Pan-alkali is just one of them.

When it comes to painting interior walls, it seems that the impression of many people still stays in the simple step of "scraping putty + painting". In fact, the scientific painting of interior walls should be a complete system. This system includes not only the treatment of the wall substrate before painting, but also the painting of the putty layer and the paint surface.

At present, the domestic interior wall supporting system generally adopts the combination of "gypsum-based leveling mortar + gypsum putty + water-resistant putty + primer + topcoat". Generally speaking, the builder completes the gypsum-based leveling mortar layer upon delivery. "Gypsum putty + water-resistant putty + primer + topcoat" is a decorative project.

Gypsum leveling mortar: directly coated on the concrete layer of the wall, the overall powder mix is ​​relatively thick, playing a rough leveling effect;

Gypsum putty: batch coated on leveling mortar layer, the overall powder ratio is between gypsum leveling mortar and water-resistant putty, play a role in fine leveling, reduce the amount of water-resistant putty.

Water-resistant putty: With two-way affinity, it has adhesion to coatings and substrates, increasing the smoothness of the substrate.

Primer: an important part of the coating system, which mainly plays a role of sealing, strengthening the base layer, reducing the water absorption of the base layer, and improving the adhesion of the top coat on the base layer.

Topcoat: After being coated on the primer, it can be converted into a thin solid film, which can protect and decorate.

In this matching system, the correct choice of water-resistant putty and primer is crucial. The matching of primer and topcoat should use matching products of the same brand to avoid product "incompatibility" and affect the quality of the coating film.

Why choose water-resistant putty?

Due to the influence of ambient temperature and humidity, the wall surface is prone to deformation and further cracks. As a role for the connection between the wall and the paint, the putty should become a "main player of the waterproof front". The water resistance of ordinary putty is not Good, the bonding strength is not enough, but it will become a "hidden layer" in the interior wall system, affecting the topcoat film formation and construction effect.

The N-type water-resistant putty has high bonding strength and water resistance, and the wall is less likely to crack, peel, and fall. In addition, after the wall is stained with water-resistant putty, you can directly scrub or directly paint the interior wall paint. Can improve the performance and service life of the coating.

How to choose alkaline heavy primer?

The base layer of architectural coatings is mostly cement mortar and mixed mortar plaster layer and putty layer, etc., which is very alkaline. Moisture and alkaline components dissolved in it continuously migrate to the surface through the action of capillaries, causing damage to the coating film. At the same time, water-resistant putty is a strong alkaline product, and its alkalinity still exists after drying.

In the choice of primer, it is necessary to use alkali-resistant sealing primer treatment. On the one hand, it is resistant to alkali sealing, making up for the problem that the interior wall putty alkali strongly affects the performance of the topcoat; on the other hand, reducing and balancing the water absorption of the base layer, helping the topcoat to form a film uniformly, avoiding the disadvantages of color difference and yellowing of the film .

What other problems might arise from improper system matching?

1. Cracking

One of the cracking phenomena is the cracks that occur during the drying process after the latex paint is applied, and the second is the cracks caused by the cracking of the wall. In response to such phenomena, the use of flexible or elastic latex paint can avoid or slow down the occurrence of cracks.

2. Bubbles and tears

Alternating spring and summer, the weather phenomenon of warming temperature and rising humidity appeared in Guangxi, Guangdong, Fujian, Hainan and other places in southern China. In this environment, if the thickness of the coating film is different, the permeability of the coating film is poor, so that the moisture in the base layer cannot be discharged, and it is easy to form a "bubbling" phenomenon. The moisture in the air gathers on the outer surface of the coating film, forming " Tears. "

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