Multifunctional Floor Grinder Description and Application: Grinding, polishing and vacuuming machines are versatile tools for a wide range of surface preparation jobs. They can be used for cleaning, flattening and smoothing concrete surfaces, leveling out high spots and curled joints, removing coating, mastics, epoxies, urethane, adhesive residues, or paint, preparing for thin-film coatings and polishing concrete and natural stone.