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Epoxy is the best sealer for concrete countertops. It fills in gaps, rough areas, and imperfections for a smooth finish and will usually last the life of the concrete. Other options include acrylic and polyurethane sealers, which protect the countertops from stains but must be reapplied every few years to maintain proper surface protection.

Concrete countertops usually cost more than granite. The average overall cost to install concrete countertops is $50 to $150 per square foot. Granite countertop costs average between $40 and $50 per square foot. While concrete materials might be cheaper than slabs of granite, the labor costs are considerably higher as it takes more time, specialized equipment and skill to form customized concrete countertops.

The angle at which you cut countertops depends on the material, your intended outcome, and the location of the cut. For example, rather than cutting a straight 90-degree angle for internal corners, cut edges at a 45-degree angle to give a clean, professional look. For outside edges, most homeowners want squared-off sides, so 90-degree angles can make the most sense there. Because you want to get angles exactly right to minimize seams and eliminate the need for patching, be sure to measure several times before cutting and use the right equipment to get sharp, accurate angles.

If you have light renovation experience, you should be able to build your own countertop made from wood or laminate. These tend to be the most DIY-friendly materials, but you’ll need to be comfortable using a circular saw and taking precise measurements. When it comes to installation, leave anything that involves plumbing, electricity, or gas lines to the pros.