Three points paint seven points construction, on the exterior wall paint a variety of problems, the causes are more complex, not necessarily a symptom is a reason. This is just like seeing a doctor, such as "cough" is not necessarily a cold. Specific problems still need to be checked by experienced paint workers on site. If the wall paint film is torn off like paper, it does not mean that the paint is not good. On the contrary, the wall paint that can be formed into one piece is that the emulsion content is relatively high and the quality of the paint is relatively good.

Sample of sand-in-water coating

If there is no trauma to the wall and the paint topcoat falls off in pieces, there are several possible reasons:

1, the quality and viscosity of putty is not good;

putty inside the glue. It is one of the important components of various putty. It is mainly to play the role of the connection between the various substances. Putty glue content is not enough, it will lead to putty itself off powder. If the putty structure itself is not strong. Even the best topcoat can be easily torn off the wall.

Water-in-water coating works

2. The primer is useless or the quality of the primer is not good, and it does not work;

The role of the primer: one is to seal the alkali, to prevent alkaline penetration into the surface, affecting the visual effect of the surface. The second is solid bottom, penetrate into the grass-roots level, solid putty layer, play the role of connecting putty and topcoat. If the primer can not secure the putty, it will lose the function of this code, and the latex paint will be torn off the wall after painting. Some coating agent dealers, the topcoat as a primer to sell, is not enough, because the function of the bottom and the function of the topcoat is completely different.

3, putty is not dry on the primer, once the paint is not dry on the second time;

The length of time the putty is completely dry has a great relationship with the climatic conditions at that time. If the weather is good and the air humidity is not high, the time required for the putty layer to dry will be shorter, otherwise it will be longer. In good weather (when the temperature is about 25 degrees), the putty can be scraped once a day, and it usually takes three days for the putty to be twice. This process, can't worry, must wait until the putty layer dry, can be polished, brush paint.

However, the time for the primer and topcoat to dry out needs to be determined according to the area of the room, and the actual weather conditions should also be considered. In rainy days and when the air humidity is large, the interval time should be appropriately extended. Under normal circumstances, the first topcoat can be brushed 3 to 4 hours after the primer is brushed, and the second topcoat can be brushed after 2 to 3 hours after the first topcoat surface is dry.

True stone paint works

4. Too much ash on the wall;

Too much ash will also affect the layering of latex paint and putty.

If you want to avoid some common latex paint diseases on the wall surface, you should avoid some common mistakes during construction, such as: don't use putty too badly; Every time putty and latex paint have to wait until the previous one is completely dry and then the second time. Latex paint cannot be mixed with too much water (especially when the materials are wrapped out, the decoration company will save as much as possible); Primer should be used, not directly painted, etc.