What is Concrete Sealing?

Concrete sealing is the application of a membrane forming or penetrating product after the concrete has fully cured.

Unlike curing, which helps concrete gain strength, sealing protects hardened concrete from outside elements. A quality sealer creates a barrier that helps prevent water and contaminants from entering the concrete.

Why Should Concrete Be Sealed?

While curing helps concrete develop strength, sealing provides an added layer of protection against the elements. A properly applied sealer helps reduce moisture intrusion, protect against deicing salts, improve freeze-thaw resistance, and prevent staining.

For concrete exposed to northern climates, sealing is especially valuable. Repeated freeze-thaw cycles and exposure to winter deicing materials can accelerate deterioration, making protection an important part of long-term performance.

When Should Concrete Be Sealed?

Timing is critical when applying a concrete sealer. Concrete should typically be allowed to cure for at least 28 days before the first sealer application. Applying sealers too soon can trap moisture and interfere with the curing process.

For the best results, seal concrete when the surface is clean and dry, temperatures are between 50°F and 80°F, and direct sunlight is avoided whenever possible. Proper timing and application help ensure the sealer performs as intended.

How Do You Seal Concrete?

Sealing concrete starts with selecting the right product for your application and preparing the surface properly. Before applying any sealer, make sure the concrete is at least 28 days old, clean, and completely dry. Dirt, moisture, or residue from previous sealers can prevent the new sealer from bonding correctly.

Most sealers can be applied with a low-pressure sprayer or roller, following the manufacturer’s recommended coverage rates and application instructions. Apply the sealer evenly, avoid puddling, and allow adequate drying time before opening the surface to foot or vehicle traffic.

Finally, remember that sealing is not a one-time maintenance item. Depending on the type of sealer and the amount of traffic or weather exposure, periodic reapplication will help maintain the concrete’s appearance and long-term protection.