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Yes, you can pour new concrete over old concrete, but you need to apply a concrete bonding agent to the existing concrete to ensure the new concrete sticks. Keep in mind that even with a bonding agent, large cracks and other flaws will still come through. If the concrete has heaved, settled, or cracked, pouring new concrete on top won’t address any root structural problems. Removing the existing concrete and rebuilding will be your best solution in that case.

Acid-based concrete stain is generally considered the best option because it lasts about four times as long and penetrates the deepest into concrete to give richer, full-bodied colors. If you prefer more vibrant colors, though, many water-based concrete stains are available that could provide a solution you can't find from earth-toned acid-based solutions.

The concrete that likely already makes up your garage floor is the longest-lasting garage floor material, although you can treat it with a variety of coverings to improve its durability. Epoxy is one of the most popular options, as it’s relatively affordable, adds strength to the floor, helps prevent staining and physical damage, and even improves the resistance to water intrusion. Other popular options for durable floor coverings include rubber, an aspartic coating, and vinyl.

Self-leveling concrete is the best option for your garage floor since it guarantees an even surface in the end. However, most garage floors weren’t made with self-leveling concrete. You don’t need to fully replace the garage floor to use self-leveling concrete. A quarter-to-half-inch of self-leveling concrete on top of your existing floor will be sufficient for a smooth and even finish.