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You could use the dry pads but wet pads with water would polish it better. Just get a rigid backing pad if you want to level the surfaces out and a flexible backer if you want the wavy surface look. The use of a cup wheel would help get things ground cleaner for a better over all finish when you are done. Some sets of pads you can get a 30 grit pad which will help you get into the stone more too. Run the angle grinder at around 2000 rpm for best results.