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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.

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.

Whether it's better to stain or paint concrete depends on your budget, desired aesthetic, and DIY skill level. Generally, staining is a more durable option because the stain soaks into the concrete's surface and won't wear away like a topical paint coating. Painting concrete can trap moisture underneath the paint layer, which may cause the concrete to deteriorate over time. However, concrete paint offers a wider variety of colors, is typically easier and less expensive to apply, and is effective at covering up existing stains or blemishes on the surface.

Other garage floor concrete sealers besides epoxy include solvent-based acrylic and polyacrylic sealers, quick-drying polymer or polyurethane sealers, and scratch-resistant polyurea floor coatings that are ideal for exterior applications. These sealants come in basic clear forms and more decorative options, varying in price accordingly.