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A concrete seal can protect your garage floor from water and stains as can an epoxy coating. The main difference is that epoxy is much more durable and better for heavy-duty wear and tear—it’s used in more industrial and commercial settings. If you’re just using the garage as storage for tools and your car, concrete sealer will do just fine. But if your garage doubles as a workshop for side projects and auto repair, epoxy will hold up better.

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.

No, you cannot permanently seal concrete. The porous nature of concrete means that it’s always vulnerable to water intrusion and staining, even under the best sealants. Although some concrete sealing products can last for a long time, a genuinely permanent concrete seal remains elusive.

The amount of paint needed to cover a two-car garage floor depends on the surface area and the product's coverage rate. On average, a standard two-car garage floor measures 400 to 500 square feet. Coverage ranges from 100 to 200 square feet per gallon for epoxy paint, depending on the product and application method. After some quick math, you may need 2 to 5 gallons of epoxy paint with two coats to cover a two-car garage floor.