How to Prepare Concrete Floor for Epoxy Paint

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Adhesion is one of the most common problems people run into when applying epoxy paint to horizontal concrete surfaces. Although a simple primer and paint is all that's needed to coat vertical concrete walls, concrete floors are an entirely different animal. If you plan to apply epoxy paint to a concrete floor, you simply must understand the important preparation techniques that are vital to providing a lasting, durable finish.

Things You'll Need

  • Broom
  • Metal putty knife
  • Chemical degreaser
  • Coarse brush
  • Pressure washer or wet/dry vacuum
  • Water
  • Muriatic acid kit for etching
  • Water hose
  • Remove any furniture and clutter from the concrete floor.

  • Use a broom to sweep away any dust or dirt from the concrete floor.

  • Use a metal putty knife to scrape up any thick mud or sticky material from the concrete floor.

  • Scrub away any greasy areas with a chemical degreasing agent and a coarse brush.

  • Use a pressure washer to thoroughly clean the concrete floor. Use a wet vacuum if a pressure washer isn't available.

  • Use water to dilute the muriatic acid. Refer to the labeling on the product for the specific amount of water.

  • Use the spray nozzle included in the kit to apply the muriatic acid to the concrete floor.

  • Wait 15 to 20 minutes for the muriatic acid to etch the concrete floor. Rinse the floor thoroughly with a water hose.

  • Repeat Steps 7 and 8 until the concrete surface feels rough to the touch.

Tips & Warnings

  • Epoxy paint won't adhere to horizontal concrete surfaces unless they're etched with acid before application. Never skip this vital step, or you'll have serious problems with adhesion.
  • Muriatic acid is capable of burning the skin and the lungs. Always read the labeling included with the kit, and follow all safety instructions.

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