To smooth sanded concrete countertops, you can follow these steps:
Clean the surface: Start by thoroughly cleaning the sanded concrete countertops to remove any dust, debris, or stains. Use a mild detergent and water, and scrub the surface with a soft brush or sponge. Rinse with clean water and allow it to dry completely.
Inspect the surface: Examine the countertop for any imperfections such as rough patches, low spots, or air bubbles. Note these areas as they may require additional attention during the smoothing process.
Fill in imperfections: Use a concrete patching compound or filler to address any imperfections on the countertop. Follow the manufacturer's instructions to apply the filler and ensure that it is leveled with the surrounding surface. Allow the filler to cure according to the recommended time.
Begin the smoothing process: Start by using a handheld diamond polishing pad or sanding block with a coarse grit (around 100 to 200) to gradually smooth the surface. Apply even pressure and make circular or back-and-forth motions while sanding. This step helps to remove any remaining roughness and level the surface.
Progress to finer grits: Once you have achieved the desired smoothness with the coarse grit, switch to progressively finer grits (e.g., 400, 800, 1500) to further refine the surface. Continue sanding in the same manner as before, ensuring even coverage and avoiding uneven patches. Remember to rinse the countertop periodically to remove any dust or debris.
Polish the surface: After using the finer grits, you can proceed to polish the sanded concrete countertop for a smooth and glossy finish. Apply a concrete polishing compound or a specialized concrete countertop sealer/polish following the manufacturer's instructions. Use a buffing pad or a handheld polisher to evenly distribute and buff the polish into the surface.
Clean and maintain: Once the polishing is complete, clean the countertop again to remove any residue or excess polish. Follow the instructions provided with your chosen sealer or polish for any additional steps or curing times needed. Regularly clean and maintain your countertop as per the manufacturer's recommendations to preserve its smooth finish.
Note: It's essential to take proper safety precautions during the process, such as wearing protective goggles, a mask, and gloves to protect yourself from dust and chemicals. Additionally, make sure to follow the instructions provided with the tools, products, and materials you use for the best results.