The classic three questions and three answers about putty

How to deal with the cracking of the putty layer after the putty is put out, what should I do?

answer:
There are many reasons for the cracking of the putty. There are external reasons and internal reasons.

1 From the outside, the dry shrinkage crack formed by the dry and wet changes; the temperature change and the temperature crack caused by the thermal expansion and contraction; the structural crack caused by the deformation of the wall structure.

2 From the inside, the quality of the product (low bond strength of the putty itself), the construction process (batch thickness, interface treatment), maintenance methods and many other factors may cause the cracking of the putty.
Solution:

Dry and wet, temperature changes or small cracks caused by excessive scraping of the batch can be polish, after painting the “wall raft”, then scraping the putty, pay attention to controlling the thickness;

The large crack caused by the thick scraping, etc., after the eradication, the “wall raft” series is apply, and the putty is scrape;
Large cracks caused by cracking of the wall. After the removal, apply the “wall 锢” series, paste the mesh cloth, and then scrape the putty. If the wall crack is large, the wall should be treated.

Why does the water-resistant putty on the wall paint sometimes appear “floating” phenomenon?

answer:
The color change of the paint is mainly cause by the chemical reaction of the paint and the change of the film itself. Factors that cause the chemical reaction of the coating:
1 On the one hand, it comes from the inside, and the internal factor is cause by the quality of the paint itself;

2 On the one hand, it comes from the outside. External factors include indoor environment. For example, if there are volatile solvent-base (oily) substances in interior decoration, these materials may cause discoloration of the paint; in addition, some systems are sensitive to alkaline systems.

It is also said that the alkaline water-resistant putty causes discoloration of the coating layer. Therefore, after using alkaline water-resistant putty, it should be sealed with an alkali-resistant primer and then paint.

When the putty is scrape, why should the construction temperature be above 5 °C?

answer:
The dissolution of the organic additive in the putty needs to be at a certain temperature, the ambient temperature of the construction is low.

the dissolution rate of the putty additive is very slow, and the additive cannot be fully dissolve, which will affect the construction performance and the quality of the putty layer in the later stage, resulting in waste of the additive.