What s the deal with foaming after scraping putty? How to fix it?

As the basic material of wall decoration, putty is mainly used to level the wall, so that the paint can show its perfect decorative effect. However, in the process of putty construction, if the details are not properly handled, there will be blistering of the putty layer, resulting in uneven decoration and application, affecting the appearance, and the bursting bubbles will spread harmful substances to the body and other hazards. Today, let's take a look at the causes of blistering.

There are many reasons for this, first of all, your wall is dirty and polluted, the second is that the putty is not stirred evenly when stirring, and the third is that when the putty is scraped again, it is too thick to wipe and it is prone to cracking and blistering. First of all, be sure to stir well when stirring the putty. And don't always go clockwise.

Stir clockwise and counterclockwise at the same time. There can be a certain pattern, such as turning left three times, turning right three times, and repeating this action more.

It is also very particular about mixing water, do not mix too much water, which will reduce the adhesion of putty, and do not let go of less water. If there is less water, the putty will not blend together, which will bring hidden dangers to the later construction effect of the wall, and then the cracks on the wall must be glued with tape or masking tape before scraping the putty, which must be done, otherwise the wall will crack and blister after scraping the putty is caused by these cracks, and the cracks will be regurgitated outward, blistering at light, and cracking and falling off at the heavy.

A small amount of glue can be added during construction, which will make your putty hard and not easy to blister, but there will be some loss in toughness. And the putty has to be beaten many times, the general construction standard is three times, each time must be firmly pressed, so that the bubbles in it can be discharged, and the putty can be well combined with each other, and the wall must be very dry, if the wall is wet, it is also one of the reasons for the putty to blister. After three coats of putty, it is sanded with fine sand.

This will prevent the formation of bubbles and will also make your walls more delicate. It has great benefits for the construction of the next process.

After the putty is stirred, the putty needs to be left for 15 to 30 minutes, so that the bubbles in the putty can slowly rise upward. Gradually discharged into the air. This also makes a lot of air bubbles out very well.

Prevent air bubbles from being left in the putty when scraping.

That is, the scraped putty powder is relatively thick and easy to blister and crack. Partial shoveling is required to re-remedy.

First, the base layer is too rough, there are subtle pores, such as the cement mortar surface layer, the surface of the wood have some pinholes, if the putty is scraped, these holes are not fully filled, heated and expanded, and the coating film will form bubbles. Generally, when scraping putty for the first time, directly use a shovel blade to crush all the small bubbles, and then scrape putty in batches to fill the holes, which is basically solved after grinding. (Note, the putty is stirred evenly, and it can be put on the wall after standing for about 10 minutes, and the standing time should not be too long, and the putty scraped should not be too thick, less than 2mm is the best.)

Second, it may be caused by the dry climate, which causes the wall to be too dry, because the putty is added with something called hydroxypropyl methylcellulose, which has good film-forming, when you wipe the putty on the wall, because the wall is too dry, you need to absorb a lot of water. While the wall absorbs water, it will release gas to the outside world, and the putty will form a film, and the gas will not come out, so bubbles will be formed. It is recommended to spray some water on the wall to moisten it, and then carry out the next step of construction after the wall has no open water, which can reduce the appearance of some bubbles.

Third, it may also be a putty quality problem. The putty on the wall has blistered in a large area, and I think the most thorough solution is to shovel it off together with the bottom layer, scrape the putty again, polish, brush the paint, and do something else, treating the symptoms but not the root cause.

The wall is not cleaned, and the putty material is dry, so add some water and stir it to try.

The reason for the blistering and falling off of the scraping putty is as follows: the bond is not firm. The cracking, peeling, and peeling of putty are mainly caused by the poor bonding between putty and the base layer.

If the base layer is not cleaned up or the treatment method is improper, the template release agent, oil co, inorganic acid and organic acid on the base layer are not completely removed, the caustic alkali aqueous solution (used to remove the wall oil stain) is not brushed, the binder is not applied or the putty formula emulsion is improperly mixed, the result will reduce the bonding strength of the putty and the base layer. The test data proves that the base layer is well treated, and the bond strength can generally be increased by 5-9 kg square centimeters, and the emulsion can improve the bonding performance of the mortar and the base layer, and the general bond strength can be increased by 4-7 kg square centimeters. The putty coating is too thick.

The thickness of the putty coating is related to the choice of material and ratio. For example, scraping large white putty, in order to facilitate the operation, the talcum powder is added more, which improves the lubrication performance of the putty, and generally does not produce excessive coating; However, if starting from the putty filling effect, the amount of large white powder increases, due to the coarse particles of large white powder, the putty has poor lubrication performance, and it is not easy to operate, and the coating may be too thick. It can be seen that the key to preventing the coating from being too thick is to properly adjust the content of large white powder and talc.

The following is the method of scraping putty: scraping putty skills are fast and flat, first put an appropriate amount of water in the bucket, generally no more than one-third of the barrel volume, and then pour in the appropriate amount of putty powder, install the electric drill on the mixing head, energize and stir, stir until the sauce can be scraped before scraping, use a broom and putty knife to clean the wall, when scraping, you must first scrape the top and the upper part of the wall, and then scrape the lower part of the wallWhen scraping the wall, try to scrape left and right, not up and down.

If you have any questions, please continue to ask questions.

The wall is not cleaned, the putty material is dry, add some water and stir it to try it, and the thickness of the putty is uneven!

It should be that the putty was not hung up properly when it was scraped.

When the wall decoration "foundation", the most important step is to batch putty, if the foundation is not laid, the wall problems will emerge in endlessly. Recently, many friends have told Uncle Craftsman why the putty in my house blisters immediately after scraping. Today, Uncle Artisan will talk about it:

An in-depth analysis of the causes of putty blistering.

01.Causes of putty blistering.

From the perspective of the base layer of the wall, there are three points to pay attention to:

1. The substrate is too rough or dry, and the plastering speed is too fast;

2. The thickness of the putty layer in a construction is too thick and greater than;

3. The moisture content of the base layer is too high, and the density is too large or too small. Because it contains abundant voids and the putty has a high moisture content, it is not breathable, and the air is enclosed in the void cavity and is not easy to eliminate.

In terms of construction:

1. Uneven stirring, after a period of construction, the foaming on the surface is mainly caused by uneven stirring, and the slurry contains powdery particles that are too late to dissolve, and a large amount of water is absorbed after construction, and swelling forms bubbles.

2. Add too much water to the putty and mix it too thin.

3. If the single-layer batch scraping is too thick, the air can not be effectively discharged, and the putty film will be lifted after the pressure is released to form bubbles.

From the putty product itself:

The use of cellulose, which is too viscous and easy to bleed air, has a relatively high overall gas content, and the base gas is enclosed and cannot remove air bubbles. In addition, some poor quality gray calcium contains a large amount of quicklime, and after adding water, a violent exothermic reaction occurs, producing a large amount of gas and causing foaming.

02.Putty blistering solution.

First of all, the wall base layer should be cleaned without oil and dust. It is recommended to do interface treatment before applying putty, apply a layer of interface agent, and then scrape and apply putty after drying.

In the environment where the wall is too dry or the wind is strong and the light is strong, it is moistened and sealed with the master craftsman solid bottom, and then the putty is scraped.

Generally, after stirring the putty evenly, let it stand for about 10 minutes to allow the various ingredients to be fully moistened and dissolved, and then stir it again with an electric mixer before putting it on the wall. During construction, the wall should be scraped repeatedly, and the scraping must not be too thick.

Pay attention to the weather during construction, the air humidity is more than 75%, and the moisture content of the wall is more than 10%, so avoid construction.

03.Choose the right putty product.

There are many putty products on the market for consumers to choose from, but consumers must pay attention to the following points when choosing putty products:

1. Choose a regular brand.

2. Choose n-type water-resistant putty.

If the climate of your city is humid and the wall is prone to moisture, then you must look for N-type water-resistant putty when choosing putty, so as to ensure the service life of the wall to the greatest extent, without foaming or mold

Today's [don't bother] decoration, let's talk about it here, and finally, I wish everyone can.

Perfectly avoid the problem of wall putty blistering!

It may be that the base layer is too rough and has subtle air holes. You can first crush all the small bubbles, scrape the putty at the bubble holes, and then polish it to basically solve it. It may also be because the climate is relatively dry, the wall is too dry, and the wall absorbs a lot of water at the same time, but also releases gas to the outside world.

You can start by spraying some water on the wall. It is also possible that the putty itself is a quality problem, and if there is a large area of blistering, the putty should be shoveled off and scraped again.

Because the walls are too dry. You can pat the wall with water to make it moist enough. Or there is too much water in the putty, which causes the putty to break in the evaporation of water.

It may be because the putty is not used for a long time, and the solution is to let the master scrape the putty again.

If there are bubbles, it means that the putty is not stirred evenly when scraping, and then the wall is plastered, we should wait for the wall to be completely dry before scraping the putty, so as to avoid the phenomenon of bubbles.

In the process of scraping putty on the wall, if bubbles are generated, it means that the putty is not evenly mixed. You can use a blender to blend your mixture into a homogeneous state. There will be no bubbles when shaving.

If bubbles appear in the putty, it may be caused by the wall being too wet, or it may be that the wall is not cleaned.

If bubbles appear, it means that the putty is caused by too much moisture. You can evaporate some of the water yourself, so that bubbles are avoided.

The reason why the walls are scraped putty with bubbles is made of putty powder.

quality problems.

Putty powder is mainly made of talcum powder.

Mixed with glue and other materials, since it is a mixture, there will be quality problems if the ratio is unreasonable, and various problems will occur after the putty powder is scraped with substandard quality, such as common foaming, powdering, peeling, falling off and other problems.

Problems caused by climatic factors.

Putty scraped in summer and winter is more likely to cause blistering problems than putty scraped in spring and autumn. Too high or too cold is not suitable for putty.

It is best to scrape putty in the season when the spring flowers are blooming and the autumn is crisp.

Blistering caused by wall problems.

Although putty powder is suitable for all kinds of walls, the quality of the scraping effect is also closely related to the wall! For example, if the wall is smooth and pollution-free, there will be no excessive blistering when scraping putty. If the wall is rough and uneven or there are cracks and sanding, the speed of batch scraping when the putty batch scrapes the wall is relatively fast, resulting in the air in the hole is not discharged, and small bubbles will be formed.

If the wall is too dry, the water absorption rate of the wall will be too high after the putty batch is scraped off, which will also lead to an increase in bubbles.

Other problems that may arise with wall scraping putty are yellowing of putty.

After the putty is completed, it will soon be partially or completely yellow. Causes:

1. The alkalinity of the base layer of the wall is high, and the putty is chemically changed by the alkalinity after scraping the putty.

Causes the putty to appear yellowing.

2. After the putty is scraped, other constructions are carried out before the putty is completely dry, such as furniture painting, paving the ground, etc., which produces volatility during the construction process.

The organic gas reacts with the undried putty, causing the putty to turn yellow.

Solution: 1. For the wall with high alkalinity of the base layer, oxalic acid should be applied.

The dilute solution is rolled on the wall for acid and alkali neutralization, and after drying, the wall is rolled twice, which can effectively prevent the putty from turning yellow due to alkali.

2. After the putty is scraped, wait until it is completely dry before other construction, such as the construction must be carried out in a hurry, the use of decoration materials containing organic volatile gases should be avoided, which can effectively avoid the putty from reacting and turning yellow.

Putty cracking After putty construction for a period of time, the surface cracks. Causes:

1. The construction of the base layer is not completely dry, and the moisture content of the base layer is required for construction.

2. The bottom layer of putty is not completely dried, just over the surface, the surface layer is dried first, and the inner layer is still in the process of drying, resulting in different degrees of drying between layers and easy to crack.

3. When the base layer is treated, the joints and leveling materials are not completely dried, and the interior wall putty with strong hardness is applied on it, which is easy to cause cracking.

4. The construction is too thick, the internal drying is slow, and the surface drying speed is faster, which is also easy to cause cracking.

Solution: 1. The putty that has cracked needs to be removed, if the crack is not too large, flexible putty can also be used for the first construction, and then the construction is carried out according to the standard construction method. 2. Each construction should not be too thick, and the front putty should be thoroughly dried before the rear scraping.