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The cost to replace a driveway coating ranges from $275 to $850, or $550 on average. Naturally, larger driveways cost more than smaller driveways. The type of driveway sealant and the number of coats also impact the cost. Coal tar sealant costs the least, while latex acrylic sealant costs the most. Oil-based sealants fall in the middle. 

Acid-based concrete stain is generally considered the best option because it lasts about four times as long and penetrates the deepest into concrete to give richer, full-bodied colors. If you prefer more vibrant colors, though, many water-based concrete stains are available that could provide a solution you can't find from earth-toned acid-based solutions.

You can whiten concrete for unsealed and unfinished concrete with a solution or either muriatic acid or bleach and water—but never both. However, if your concrete does have a stain, finish, or polish, keep in mind that these hard chemicals could damage the topcoat. Your best bet otherwise is to power wash outdoor concrete slabs or clean indoor ones with a gentle cleaner such as laundry or dish detergent.

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.