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If your garage floor is heavily soiled or stained, then it’s a good idea to powerwash it with a concrete cleaner before sealing. This process will remove dirt and debris to help the new sealer bond to the concrete properly, and it will also improve the look of your sealed garage floor. After power washing your floor, make sure you let the concrete dry completely before applying sealant, usually for 24 to 48 hours.

The actual moisture level that is acceptable for your concrete floor depends on what primer or flooring material you plan to install above it. For this reason, you should check the manufacturer’s instructions for the exact details.

Generally, the moisture levels should be 3.5% to 4.5%, although it does vary. Some products can handle higher levels of moisture, so you should always test your concrete before purchasing your flooring materials.

Most garage floor paints are epoxy-based and available in DIY kits. One-part epoxies are simpler to apply than two-part epoxies, which have a more involved process. Sometimes, people also use latex-based paint because it’s easier to clean up mistakes with soap and water. Either way, make sure your paint is specifically designed for concrete garage floors. It should say so on the label.

Unlike staining concrete, painting concrete often results in chips and peeling over time. You can expect numerous touchups over the years if the concrete is in a high-traffic area. Since concrete paints are opaque, you may also find it more difficult to get the exact color results you want. Lastly, painting concrete can make it much more slippery unless you mix in an additive for traction.