If you have taken the plunge and installed concrete countertops in your bathroom or kitchen, you may have learned that they can sometimes become stained, cracked or chipped. While this will probably not occur until after years of use, you probably don't want to shell out big bucks to a professional refinisher to make your countertops look new again. Luckily, making simple repairs and refinishing your concrete countertops is a job that you can complete yourself.
Save the formula used to create the concrete for your countertop, if it is a specialty color. Have a small amount of concrete mixed to match at your local hardware or home improvement store. Use this concrete to carefully fill any deep depressions of chipped holes. Smooth the surface with a metal finishing trowel and allow these areas to cure for 24 hours.
Sand your countertops to remove minor scratches and stains. Put on work gloves, protective goggles, and cover your nose and mouth with a paper mask. Prepare an orbital sander with a 100-grit disc. Beginning at one end of the countertop, sand the entire surface in long, even lines. Horizontal lines are faster for uninterrupted countertops, but vertical lines are a better choice if you have a sink or range inset. Remember to sand the edges of your countertop as well. Examine your countertop for any remaining small chips, scratches or stains. Repeat the sanding procedure until the countertop is pristine once again.
Seal your countertops to prevent damage in the future. Pour some concrete sealant into a plastic paint pan and use a clean paintbrush to apply it. Use long, even lines. Allow the sealant to dry overnight before using your countertop again.