How to Properly Prep and Paint a Concrete Garage Floor

Concrete is essentially a thirsty sponge, and if you simply roll paint over a dirty garage floor, you are setting yourself up for peeling, bubbling, and frustration within months. A garage floor bears the brunt of heavy tires, oil drips, and shifting temperatures, meaning it requires a chemical bond rather than just a surface-level coat of paint. Done well, this project transforms a dusty, stained slab into a clean, sealed surface that resists moisture and wipes down easily. The secret lies entirely in the preparation. If you commit to the scrubbing and the etching process, you will end up with a professional-grade finish that holds up to years of daily use.

1. Empty and Sweep First. Empty the garage completely and remove all grease, oil, and debris. Use a stiff-bristle push broom to clear away loose dust, then vacuum the corners thoroughly.
2. Attack the Oil Stains. Apply a heavy-duty concrete degreaser to the entire floor. Scrub the area vigorously with a stiff-bristle brush, focusing on spots where vehicles usually park.
3. Open the Pores. Apply a concrete etching solution according to the manufacturer's directions. This acid-based cleaner opens the concrete pores so the paint can grip the substrate.
4. Rinse and Wait. Pressure wash the floor thoroughly to remove all residue from the etching solution. Allow the floor to dry completely for at least 24 hours.
5. Edge the Perimeter. Use a high-quality sash brush to paint a two-inch border around the perimeter of the garage. Keep your lines straight and avoid loading too much paint on the brush.
6. Roll Toward the Exit. Pour the paint into a tray and use a long-handled roller to apply the coating in three-foot by three-foot sections. Use a 'W' or 'M' pattern to ensure even distribution and avoid roller marks.