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When properly installed and maintained, concrete floors can last from 50 to 75 years or more. The longevity depends heavily on the finish and maintenance routine. For example, polished concrete floors can last 50 years or longer but require periodic refinishing or resealing every 5 to 20 years, depending on foot traffic. To maximize the lifespan of any concrete floor, it's crucial to have it installed by a licensed professional, ensure it is properly sealed to prevent damage, and perform annual deep cleanings.

The amount of paint needed to cover a two-car garage floor depends on the surface area and the product's coverage rate. On average, a standard two-car garage floor measures 400 to 500 square feet. Coverage ranges from 100 to 200 square feet per gallon for epoxy paint, depending on the product and application method. After some quick math, you may need 2 to 5 gallons of epoxy paint with two coats to cover a two-car garage floor. 

The cost to overlay or resurface a garage floor averages about $3 to $9 per square foot, depending on the preparations involved, the size of the floor, and the type of finish. Some decorative topcoats like stamped concrete and ornate overlays can cost from $7 to $20 per square foot, depending on the complexity of the design and 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.