What causes velvet art paint bulging?

Reason 1: Generally, the wall foundation at the bulge is not treated well, one is that the construction is not clean and floating, and then the wall is oily or waxy.

Reason 2: The construction is not standardized enough, and the wall base layer is brushed with latex paint before drying, which may also be caused by the original cement layer not being cleaned before scraping putty.

Reason 3: The material itself is not good, such as the putty glue problem.

Reason 4: The interior of the wall is damp.

The specific steps are to shovel off the blistered part of the cement wall, seal the bottom with a primer, dry and then scrape the putty, and then polish, primer and topcoat. If you want not to affect the aesthetics, you should spray (brush) the entire blistered wall at the end, because of the newness, the texture will be poor.

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Wall blistering refers to the protruding round bubbles of different sizes after the wall paint coating is painted for a period of time, also known as bulging, especially in the decoration of old houses, the main reason for blistering is that the walls of the house contain alkali and moisture.

Some older houses use clay bricks, which absorb more water and have a moisture content on the walls.

There is a resurgence of moisture, and in the past the house did not have a vapor barrier.

Or because the moisture barrier has failed for too long, it cannot play the role of protecting the wall.

When the water evaporates in dry weather, the salt and alkali will crystallize on the surface of the wall and near the shallow layer of the coating, and the volume expands outward during crystallization, resulting in bulging.

In order to complete the construction as soon as possible, the construction personnel carry out the construction when the surface is not completely dry when the wall base is cleaned, or add too much water in the process of paint mixing and color matching, which leads to the thinning of the film-forming coating of the art paint, the tension becomes smaller, and the elasticity is not there, which reduces the overall adhesion of the art coating.

1. Rainy days.

The climate is humid and try not to construct, even if it is sunny, it is necessary to avoid direct sunlight, resulting in the rapid evaporation of water and the poor effect of film formation, and the blocking measures should be done in time, and the temperature of the construction wall should not be less than 10 degrees Celsius.

The moisture content does not exceed 8%.

2. For the second decoration of old houses, try to clean up the base layer of the wall, and add an extra layer of moisture-proof layer when necessary to avoid hollowing caused by the phenomenon of moisture return.

Bubble. 3. Blistered art paint wall repair, remove the blistered part and reclean and strengthen the wall base, and it is best to use putty with waterproof function.

After that, the art paint is repainted.

Construction conditions: the construction temperature is not less than 5, the moisture content of the base surface is less than 10%, and the air humidity is less than 85%;

Construction tools: batch knives, rollers, spray guns, brushes, washboards, rags and other modeling tools;

All of these factors can cause bulging.

Velvet art paint bulges because there is something inside it that is not paved.