surface picking

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    How to increase the strength of leveling wall putty

    formula: 325 cement 400kg, Fly ash 200kg, Ground Calcium Carbonate 400kg, Hydroxypropyl Methyl Cellulose 3KG, thixotrope 0.8, wood fiber 2, Redispersible polymer powder 5kg, After construction, Wall surface picking. how to solve this problem? Can we add polyvinyl alcohol? How much better.