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. 

Concrete sealers will help your garage floors resist water, but they will not make the floor waterproof. You will need to purchase a specific waterproof floor paint for concrete and apply several coats over several days if you want your garage floor to be truly impermeable. While the process is similar to sealing the floors, the materials are different, and the need for multiple coats will extend the process and drying time.

The type of paint you use on concrete influences how long it will last. Epoxy paint can last as long as 30 years and often comes with a warranty for at least 15 years. Another factor impacting the longevity of the paint is how much wear and tear the floors receive, such as heavy machinery or constant foot traffic, which can shorten the life span. 

Generally speaking, epoxy is the best garage floor coating. There are two main types of garage floor coating you can consider: epoxy and polyaspartic. Epoxy coating comes at a more affordable price but loses when it comes to durability and long-term use. Polyaspartic coatings cost more and don’t offer as much traction, but they withstand accidents better and don’t tend to fade. Most homeowners choose an epoxy coating.