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If your garage floor is heavily soiled or stained, then it’s a good idea to powerwash it with a concrete cleaner before sealing. This process will remove dirt and debris to help the new sealer bond to the concrete properly, and it will also improve the look of your sealed garage floor. After power washing your floor, make sure you let the concrete dry completely before applying sealant, usually for 24 to 48 hours.

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.

Costs depend on coating type, labor, site preparation, and required finishes.

Sealing the concrete before tiling is recommended to help it stand up against any water that may seep through the tiles or grout. After thoroughly cleaning the concrete with TSP, priming with a concrete primer will seal the concrete. Check the label on the primer to make sure it is also a sealant and follow the manufacturer’s instructions for application.