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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.

Concrete can take years to fully settle, but interior concrete floors are mostly settled after a year. Shifting and settling can occur throughout your home’s life, but most major settling happens the first few years after the concrete is poured. It’s not uncommon for minor cracks to appear in concrete floors over time—check with a concrete pro to ensure new cracks don’t indicate a structural issue in your home.

Epoxy and polyurethane sealers can last five to 10 years, while acrylic sealers last two to three years or more depending on the use, wear of the surface, and type of sealer you choose. Areas that see heavy traffic or extreme ice and snow may require more frequent sealing. Test your concrete every two years to gauge how it responds to absorbing water or if it fully repels it for longer than 20 seconds.

The cost to seal concrete is around $1,500 on average, but you could spend anywhere from $1,000 to $7,000, depending on the type of sealer used and the size of the space. You may want to seal concrete that receives a large amount of foot traffic or heavy wear. While you can seal concrete yourself with materials from a home improvement store, you must ensure the surface is clean and ready to accept the sealer. Hiring a professional is often recommended to ensure good, even coverage that provides adequate protection.