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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.

When you’re painting a garage floor, it’s best to use a combination of rollers and brushes. You’ll want to start with a brush, making a border around the edges where the floor meets the wall. From there you can use a roller, though some people also like to do the entire first coat with a brush because it’s easier to work the paint into the textured concrete.

Apply two coats of paint to a garage floor after priming for optimal results. The first coat serves as a base layer, providing adhesion and coverage. Allow the first coat to dry thoroughly before applying the second coat, typically after 12 to 24 hours. The second coat ensures even coverage and durability and enhances the floor's appearance. Additionally, applying two coats helps to create a more substantial barrier against stains, chemicals, and wear and tear, resulting in a longer-lasting finish. 

It depends on the type of sealer. Some sealers can dry in as little as 4 hours, but many can take up to 48 hours to fully cure. To play it safe, don’t drive on your driveway for two days after sealing.