How important is preparing the substrate? What is the best way to apply a cementitious mortar?
Preparing the substrate (i.e. the wall or the floor) well is very, very important. Remove any loose, crumbling or degraded material which is not solidly attached to the wall. Clean the surface thoroughly. Wet the surfaces. We would advise you to apply an adhesive coating, sprinkling or rendering first. Make this coating from the mortar you are currently using plus a fixing adhesive additive. Mix to a fluid consistency and then apply a thin coating to the surface. Next, apply the mortar a coat at a time applying each coat before the previous coat has time to set.
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