Will the wall appears the situation like hollow or fallen off from the wall?
Generally, these situations like hollow, cracked or fallen off from the wall related to the wall’s material, the sand’s material and the ratio of the cement and sand, it’s nothing to do with the machine. If the small sands meet a cement wall, it’s likely to be hollow wall; and the mortar with too much mud will be easy to crack; and if the mortar fell off the wall maybe is preparation work like roughing the wall or the mortar is too thick or the ratio of the cement is not enough and so on, you cannot blame the machine for all those situations.
You can use the machine to plaster a prototype room to see the effect.
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