I think the sanded Grout would need to come out and be re-grouted first. Grinding the floor would cause the sanded Grout to chunk out and it is always better to be safe than sorry.
Was wondering if this would work on a complete grind of a marble floor with sanded grout. Flatten and hone to 100 metals or 50 resins. Clean floor with a spinner. Slurry floor with a fairly loose non sanded grout and allow to dry. Then continue honing on up. Maybe re slurry at 220. Thinking the NS grout might hold together the sanded grout.
Thoughts
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