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Interlocking garage tiles made with PVC are the most effective for garages with past issues of humidity and flooding because damp concrete is not suitable for paint. Epoxy coating is also water-resistant and can prevent mold buildup. Finally, porcelain tiles are a wonderful option for wet conditions if your budget allows.

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.

Exterior paint finishes come in a variety of options, but for concrete, your best bet is to go with an eggshell, satin, or semi-gloss latex paint. All three options are more durable than matte finishes and should help hide imperfections on your home’s concrete surface.

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.