Finishing Concrete CountertopsFinishing concrete countertops can be done many ways. I'll cover how to polish the surface to a matte finish or a high gloss finish. Polishing concrete countertops gives you a very smooth, hard, dense surface that's easy to clean and maintain. There are a few different looks you can achieve when you polish a concrete countertop. You will need an orbital hand held sander or a hand polisher. You will also need wet diamond polishing pads from 50 grit to 3000 grit depending on the look you are trying to achieve. EXPOSED AGGREGATE - You achieve this finish by removing enough surface material to expose the underlying aggregate in the countertop mix. You will need a professional hand polisher to best achieve this look.
SALT & PEPPER - You achieve this finish by removing just enough surface material to expose the underlying sand in the mix but not enough to expose any of the aggregate.
SMOOTH - You achieve this finish by just honing the surface lightly with an orbital sander or hand polisher and a diamond pad.
1. If you just want a smooth surface, start with the orbital sander and a 200 grit polishing pad. Sponge some water on the surface of the countertop to completely wet it. Keep the surface wet as you run the orbital sander over the entire surface of the countertop. Don't put too much pressure on the orbital sander or you will remove enough surface material to expose the sand and maybe the aggregate in the concrete. Lightly go over the entire countertop surface to remove any imperfections and smooth the surface. Clean the surface with water and a hand squeegee. If it looks good, with no scratches or pin holes then you are done. 2. If you want a salt & pepper look or exposed aggregate look, then start with the 50 grit polishing pad. Wet the entire countertop surface and keep it wet as you are polishing. Remove just enough surface material until you achieve close to the look you are going for. Take the 50 grit pad off and put on the 100 grit pad. Continue to wet the surface and run the sander over the entire countertop surface until you have achieved the look you desire. Move up to the 200 grit pad and continue to polish the surface, remove the dirty slurry water from the surface and add clean water as you are polishing. Go from the 200 grit pad to the 400 grit pad, the surface should really start to feel smooth and hard now. After you're done with the 400 grit pad, clean the entire surface area with water. You should notice some pin holes in the surface of the concrete countertop. This is normal. Finishing concrete countertops without any pin holes requires mixing up a batch of slurry from your concrete mix. This slurry can be about the texture of pancake batter. Cover the entire surface area of the countertop with this slurry, filling in all the pin holes. Scrape off any excess slurry, leaving a light film over the entire countertop surface. Let this dry overnight. The next day, lightly go over the countertop with the 400 grit pad and water one more time. This will remove the film of slurry and all the pin holes will be gone. If you like this matte finish you can stop here. If you desire a highly polished finish, continue to polish the surface as before using polishing pads from 800 grit to 3000 grit. Once you get to the 3000 grit pad the surface will be very glossy and reflective.
CHENG has a great video about finishing concrete countertops that shows this process in detail. Polishing Concrete Countertops by Fu Teng Cheng Click on the links below for more information: HOW TO MAKE CONCRETE_COUNTERTOPS CONCRETE_COUNTERTOP FACTS CONCRETE_COUNTERTOP REINFORCEMENT Return from Finishing Concrete Countertops to Concrete Countertops
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