A thermal finish on natural stone does not affect the ability of either type of "MammothMITE" vacuum to hold th estone securely. Textured surfaces (the natural cleft surface on some stone) is a different matter. The cleft surface is a problem for the 12v battery-powered vac but the 110v MammothMITE handles this with ease. Again, a thermal finish is not a problem for either unit (12v or 110v).
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