How can I remove or level grooves in thinset mortar from a concrete slab?
I was thinking of a grinder like this disc for concrete I have one I bought years ago for my 9" grinder the disc is 12" it will take a entire single bay garage floor surface in about 2 hours. Cheaper than shot blasting and my disc has done 5 or 6 garages and still has a couple left. The trick is to keep the grinder moving in overlapping orbits. the link shows a smaller model that should be able to do the 130 sf in an hour or so.