What are the causes of blistering of putty powder?

Calcium ash powder (the main component is calcium hydroxide, which is a refined product of lime) and bicarbonate powder (the main component is calcium carbonate, which is a calcium carbonate powder directly ground from calcium carbonate) generally do not cause the phenomenon of blistering of putty powder after use.

 

Calcium ash powder (the main component is calcium hydroxide, which is a refined product of lime) and bicarbonate powder (the main component is calcium carbonate, which is a calcium carbonate powder directly ground from calcium carbonate) generally do not cause the phenomenon of blistering of putty powder after use.

 

Causes of blistering

The main causes of blistering of putty powder are as follows.

1. The viscosity of For Wall Putty/Plaster is too high.

2. The putty is easy to produce bubbles at high temperatures.

3. The base is too rough and has small holes. When scraping, the putty compresses the air inside the hole, and then the air pressure bounces back to form bubbles.

4. Single batch scraping is too thick and the air inside the putty pores cannot be squeezed out.

5. The base is too dry and the water absorption rate is too high, which may lead to more surface putty bubbles.

6. Sealing substrates, such as waterproof paint, advanced concrete, etc., are not sealed and blistered.

7. The water absorption of the substrate is too low, resulting in the relative water retention of the putty when scraping is too long, leaving the putty in a pulpy state on the wall for a long time without drying, so the bubbles are not easily extruded by the trowel and produce pinholes. The pores are the reason why there are more air bubbles on the top of the formwork than on the walls in the project. The walls absorbed a lot of water, but the top of the formwork absorbed very little water.

 

 

Solution of blistering

1. When polishing the interior putty surface, it is important to get the right polishing time. The best time to polish is immediately after the watermark on the putty surface disappears. Practice has shown that 1~2m2 of veneer should be levelled or polished.

2. After the exterior putty surface has dried, it should be properly polished and sprinkled with water. General maintenance is divided into two or more times. If necessary, use a clear closed primer mixed with water (1:5) as a second spraying for better results.

3. The product must be used within the warranty period. If the warranty period is exceeded, a test scraping must be carried out. construction only after passing inspection.

4. The product must pay attention to the waterproof treatment. It should be stored in a cool and dry place with the package intact.

5. In summer or under high temperature and windy conditions, it is best to wet the wall surface with water before applying the putty. Putty can be applied after the wall surface is clear of water.