Second, the thickness of the cement slurry plastered on the wall should not be too thick,1-1.8cm..

3. Before plastering the cement slurry for the first time, the hair on the wall should be chiseled, that is, many small pits or pits one by one should be chiseled on the wall, not too deep 1- 1.5 cm, so as to enhance the adhesion between the cement slurry and the wall.

Fourthly, the sand mixed with cement must be washed sand. The smaller the silt content, the better, and the stronger the cohesive force of cement mortar.

Fifth, see if the cement has expired. .

I hope the above answers are useful to you.