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
- Metal putty knife
- Chemical degreaser
- Coarse brush
- Pressure washer or wet/dry vacuum
- 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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