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Yes, you can seal an old concrete floor as long as you remove stains and repair damage before sealing. Remove everything from the garage and clear the floor throughout with a concrete cleaner and power washing. Fill in cracks larger than 1/8 of an inch wide and remove all grease and rust stains before sealing. Make sure your concrete is fully dried before applying sealer.

Polished concrete gets its glass-like finish from several rounds of polishing, using increasingly finer grit diamond grinding pads. The concrete’s hardness will determine which grits you need to get your desired finish. The densifier and sealer also contribute to the look of the final floor, so either talk to a concrete pro (or hire one) to achieve the right concrete floor finish.

Concrete is the most popular garage flooring option because it’s durable and can stand up to the weight of vehicles. If you plan on using your garage to park your car or store heavy items, concrete is a solid option. However, if you want to convert your garage to a living space, you can choose any number of flooring options to go over the concrete foundation, including wood, tile, and even carpeting.

A concrete seal can protect your garage floor from water and stains as can an epoxy coating. The main difference is that epoxy is much more durable and better for heavy-duty wear and tear—it’s used in more industrial and commercial settings. If you’re just using the garage as storage for tools and your car, concrete sealer will do just fine. But if your garage doubles as a workshop for side projects and auto repair, epoxy will hold up better.