Concrete sealer, found at Menards, provides a protective layer on concrete surfaces, enhancing durability and aesthetics. It prevents moisture penetration, staining, and damage from chemicals and abrasion. Highly rated options include penetrating, film-forming, impregnating, and topical sealers from top brands like Rust-Oleum and Sherwin-Williams. Choosing the right sealer depends on the specific requirements of the project. Before sealing, proper surface preparation is crucial, including cleaning, repairs, and moisture testing. Application methods vary based on sealer type, and safety precautions must be followed. Regular maintenance helps preserve the sealed surface, ensuring optimal longevity and performance.