The reason why gray calcium powder coating falls off the powder

There are two main reasons why gray calcium powder coating drops powder after being used: 

It may be that the quality of the gum powder is not good or the amount added is not enough. If this is 

the reason, you need to choose a better quality of glue powder, or increase the amount of glue powder.

It may be related to gray calcium powder, one is that the purity of gray calcium powder is not enough,

 if so, you need to increase the amount of gray calcium powder; the other is that the content of calcium 

hydroxide in the gray calcium powder is too low, resulting in insufficient hardness. So, choosing a good 

gray calcium powder is the key!