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Concrete grinder will give you a rough surface. Sandpaper will not last long unless it is a diamond grit, which are usually discs that fit on angle grinders. The following contractors can smooth the finish for you: commercial flooring contractors that install terrazzo floors or stone floor refinishers. Third possibility is granite counter fabricator, but they may not be comfortable with this work.
Any of these contractors will have a walk behind wet grinder that can be fitted with randomly orbiting diamond grit discs mounted on flexible pads. The pads are available in various grits from 400-2000 (polished countertop) to meet your needs. Since its wet there will be little dust and the flexible discs will smooth without grinding everything perfectly level.
Any of these contractors will have a walk behind wet grinder that can be fitted with randomly orbiting diamond grit discs mounted on flexible pads. The pads are available in various grits from 400-2000 (polished countertop) to meet your needs. Since its wet there will be little dust and the flexible discs will smooth without grinding everything perfectly level.