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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.

You can seal a concrete slab by cleaning the surface, filling in any cracks, etching the surface, applying a sealer, and letting it dry. Concrete slabs don't typically need sealing, but you can use a topical concrete sealer if you notice signs of water damage. If you haven't already fixed the cause of the leak, then you'll want to repair the plumbing before you seal a concrete slab.

You’ll usually need to prime a garage floor before painting—especially if the floor is unpainted. Garage floors are made from concrete, which is porous and produces dust. The dust can contaminate the paint and cause issues with adherence. 

Primer creates a barrier and gives you a clean surface to work on. It also minimizes absorption to help give you an even, pro-looking paint job. Make sure you choose a primer that’s specifically designed to cover concrete flooring.

Depending on the finish and area size, costs range from $3 to $10 per square foot. Decorative finishes increase costs.