How Do You Sand Down Concrete?


Quick Answer

To sand down concrete, remove any coating, seal the cracks and joints with an epoxy filler, attach metal-bonded diamond discs to a grinder, and sand the surface of the concrete. Start with a 30- or 40-grit diamond disc, and slowly increase the grit until you reach the desired finish.

Continue Reading
Related Videos

Full Answer

  1. Remove the concrete coating

    If the concrete is coated, attach a 16- or 20-grit metal-bonded diamond disc to a floor polisher or handheld grinder. Sand off the coating.

  2. Fill in the gaps

    Apply a semi-rigid filler such as an epoxy filler. Let the filler cure before proceeding.

  3. Sand the concrete

    Attach a 30- or 40-grit metal-bonded diamond tool to the grinder, and sand the surface of the concrete. Once the entire surface is sanded, change the diamond disc to an 80-grit one, and sand the floor again. Repeat the process with a 150-grit metal-bonded diamond tool.

  4. Make the concrete denser

    Apply a specialty chemical hardener to the concrete.

  5. Polish the concrete

    If you want, continue upgrading the sanding discs until you achieve a glossy finish. Switch from a metal-bonded disc to a resin-bond one. Attach a 100-grit tool to the grinder, and sand the surface. Repeat the process with 200 then 400, 800, 1,500 and 3,000 grits.

Learn more about Building Materials

Related Questions