Got 1500 sq ft concrete floor that's painted. It's in pretty bad shape. Thinking of using 60 grit sanding screens, might be able to get a hold of a diamabrush coatings removal tool (10 blade, 25 diamond grit), run on a 20" 175. Never done removal before, not sure what to expect for time. From what I've found online I'm thinking this might be a 2 day job (only have 7 hour windows to work in). Also trying to figure how many screens I'd need. I'm looking at 3 coats of paint to remove.