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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.

The best time to seal your concrete driveway is sometime in the spring and fall when the temperature is above 55 degrees Fahrenheit. Keep an eye on the weather, and be sure to pick a day without rain on the forecast for at least 24 hours. Lastly, be sure you can leave the space free of foot and car traffic for the full drying time.

Mix the resurfacer into a sticky mixture. The consistency should look like mashed potatoes. Use a squeegee to push the resurfacer across the pitted area and smoothen the surface with a cement trowel flush. Make sure you protect any expansion joints with a weather strip. Alternatively, cut out any resurfacer that touched the joint once the mixture begins to harden.

It costs between $600 and $8,400 to stain an average-size concrete patio of around 300 square feet. The wide price range accounts for intricate stains that incorporate multiple colors and stenciling, high-end sealers, and special touches, such as stamping or concrete polishing. Prices can also vary if you need to make multiple repairs to your patio before adding the stain and seal.