We use commercial grade, non-yellowing, UV resistant, high solid acrylic-based sealer on decorative concrete and commercial grade penetrant sealer for broom finished concrete. Decorative sealer is designed to last one year on the first application and 3 to 5 years on additional applications. Penetrant sealer is designed to last up to 10 years per application on broom finished concrete. The life expectancy of any kind of sealer is dependent on a variety of factors such as exposure to sun light, traffic, and the surface to begin with. We have found that the frequency at which concrete should be re-sealed largely comes down to personal taste. Some of our clientele prefer a clean, bright, glossy surface (seal every year), whereas others like to seal once and then let the concrete develop its own patina over time. The good news is that the sealers we use do not abruptly fail or peel away. It is a slow process of incremental degradation that is largely indiscernible. Most any surface can be cleaned and sealed, or re-sealed as the case may be.