Yeah the diamond grinding cups are not cheap. Infinitely better, but not cheap. Did you check if princess auto has a knock off version? Never know with them what they have. I noticed a week or two ago they had the big helicopter concrete finishers now so maybe they do have more like products.
If you use a disk to grind it hose down the floor first. It will help catch dust and make cleanup easier. Still use the shop vac as well of course.
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