Before applying paint to a previously painted concrete floor, it is crucial to thoroughly clean the surface to ensure proper adhesion and a smooth finish. Start by sweeping or vacuuming the floor to remove any loose dirt and debris. Next, use a degreaser to eliminate any oil or grease stains. For areas with heavy stains, consider using a pressure washer to deep clean the concrete.

After cleaning the surface, it is recommended sand to roughen the current floor paint to increase adhesion of your new coating. Plus this is a good time to scrape or remove any loose paint. Etching the concrete isn’t needed as it is already painted. If you windup with a lot of bare concrete then consider etching these areas to increase adhesion. This can be done using a diluted muriatic acid solution or a commercial etching product. Be sure to follow the manufacturer’s instructions carefully and wear proper protective gear during this process.

Once the concrete is cleaned, sanded and etched, allow it to dry completely before applying a paint specifically designed for painted concrete surfaces. Floor epoxy is a good option. This will ensure long-lasting results. Apply the paint following the manufacturer’s instructions, and allow sufficient drying time between coats for the best finish.