Prep your work area by cleaning it and adding tape around the edges to prevent the water from splashing on the floor.
Using the orbital sander with the diamond polishing pads and the hand polishing pads, sand down the countertops to remove the stains.
Mix together polyblend non-sanded grout and water and use a putty knife to apply a thin coating and fill in micro holes in the concrete to create a solid surface.
Use a microcloth to wipe off any excess grout. Allow 24 hours to completely dry.
Using the sander and diamond polishing pads, sand the countertops one more time. Allow them to dry for 24 hours.
Prep counters to seal by mixing together a 1:1 ratio of Counterhard Prep and water. Apply the mixture to the counters with a damp microfiber cloth using large circular or S-shaped motions. Allow to dry for 20 minutes, then repeat the process to apply another coat. Dry for 20 minutes again.
Next, apply 1 coat of full Counterhard. Allow to dry for 20 minutes. Repeat the process and sllow to dry for 24 hours.
Use a microcloth to apply Buddy Rhodes' Satin Concrete Sealer in large circular or S-shaped motions. Allow to dry 20-30 minutes then apply another coat. Repeat the process several times. We applied 5 coats. After the last coat, allow the sealer to dry overnight.
The following morning, test the countertop seal by dropping a few drops of water around the counter. Leave them for 30 seconds and wipe away. If spots appear, you'll need to apply at least another coat of sealer. If no spots appear, the counters are sealed.