If there are small stones mixed in the sand or mortar, will it influence the machine and the plastering plate?
That totally will be no influence on the machine and the plastering plate, because the plate is made of hard aluminum alloy, it’s harder than the drill. Small stone (normally its size is smaller than the thickness of the plastered wall) can’t be seen after the wall is plastered. Even the small stone is thicker than the plastered wall, and the plate is mobile, it’s easy for the plate to pass. If the machine is stuck by the stone, the machine is equipped with overload protection, it won’t damage the machine.
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