Why do my grout plasters have small air holes after applying them?

[Luis]

Gypsum 500
Limestone 500
PVA 3
Cellulose ether 1.5(100000cps)
Retarder 1.5
Thixotropic agent 0.5

 

[Ramon Doria]

Look at the compatibility between thixotropy and limestone powder.

 

[Allen]

PVA is prone to pores. Using 0.5 water reducer can solve the problem.

 

[Shamil]

Try changing to(75000cps) cellulose ether

 

[Ankur]

Just add some thin sand, 8-10% is enough.

 

[Chanliss]

Change limestone powder or cellulose ether.

 

[Scott Kaplan]

It should be honeycomb eyes. This situation has something to do with limestone powder and cellulose.

 

[Cassie]

The cellulose has a more or less air-entraining effect. At present, I am still looking for a way to eliminate it. I can only reduce it as much as possible. Use a thicker powder to see if the effect will be better.