Understanding the Difference Between Sealers and Coatings for Concrete
- Sep 19
- 2 min read
Have you ever wondered why some products used on concrete are called sealers while others are called coatings? Both form a protective film on the surface, but they perform very differently. Knowing the difference helps you choose the right product for the right job.
Acrylic Sealers
Acrylic sealers are the most common products used on exterior concrete. If you’ve ever sprayed a cure & seal, it’s almost always made with an acrylic resin. These resins start as solids, get melted into a liquid, and are then blended with a carrier so they can be applied. Once sprayed, the carrier evaporates and the resin returns to a solid state, forming a protective film.
Acrylic sealers don’t require a hardener to cure, and they bond well to almost any concrete surface without surface profiling. Because of their chemical makeup, they create a breathable film—meaning moisture vapor can pass through. That’s why they’re ideal for stamped concrete, decorative flatwork, and exterior projects where breathability matters.
Over time, acrylic sealers wear away and need to be reapplied. Fortunately, resealing is simple since they form a chemical bond and don’t require surface abrasion before recoating.
Concrete Coatings
Concrete coatings include products like polyaspartic, epoxy, and urethane. These are different from acrylic sealers because they require a hardener. Most come in two parts that must be mixed. Once combined, a chemical reaction starts, and as the product is applied, the carrier evaporates and the coating hardens.
Unlike acrylics, coatings usually have a much higher solid content. This results in a denser film that is essentially non-breathable. Coatings don’t allow moisture vapor to pass through, which makes them intolerant of being applied directly over damp or unprepped surfaces. They require mechanical surface preparation—like grinding or shot blasting—to create a profile and open pores in the concrete for proper adhesion. Skipping this step often leads to peeling or delamination.
Because coatings form such a dense layer, they are also highly resistant to chemicals and abrasion. However, when it’s time to recoat, the surface must be abraded for the new layer to bond.
Final Thoughts
Both sealers and coatings have their place in decorative and functional concrete work.
Acrylic Sealers are best for exterior concrete, like stamped patios, driveways, and decorative finishes. They’re breathable, easy to apply, and simple to recoat, but typically last only 3–5 years before reapplication is needed.
Concrete Coatings are better suited for interior applications where long-term durability is critical. Metallic epoxy floors, broadcast systems, and high-traffic industrial flooring are all ideal uses for coatings thanks to their strength, chemical resistance, and glossy finishes.
By understanding the differences, you can match the right product to the project and get results that last.
