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Hi guys, very much appreciated your Reponses and explanations, very helpful. Martin

no, I did not. so the pro roc base coat can be applied over concrete without cracks based on your experience?

do you mean polyvinyl alcohol for PVA? it is a primer I suppose? I directly applied plaster without PVA.

Hi plaster folks, recently I applied Proroc multifinish over concrete slab just to see the setting, hardness, etc. to my great surprise, I find it cracks very badly. is it common? I wonder if this is such a terrible product, how can it manage to become quite popular. is there anyting wrong...