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The actual moisture level that is acceptable for your concrete floor depends on what primer or flooring material you plan to install above it. For this reason, you should check the manufacturer’s instructions for the exact details.

Generally, the moisture levels should be 3.5% to 4.5%, although it does vary. Some products can handle higher levels of moisture, so you should always test your concrete before purchasing your flooring materials.

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.

The best way to resurface a concrete porch is to clean and prep the surface, pour a layer of concrete on top, allow it to cure, then seal it. A concrete overlay provides a durable layer and enhances your porch's look. You can even choose a stamped overlay to make it look like stone or brick. To ensure structural integrity, repair concrete cracks before applying the new concrete. If the existing concrete is in significant disrepair, consider removing and replacing the concrete instead of an overlay.

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.