Clear sealers, whether acrylic, polyurethane, epoxy or polyaspartic, create the barrier between surface and climate necessary to maintain performance and good looks for as long as possible. When choosing an outdoor sealer, take into account the abuse created by local weather conditions. Chicago summers can be hot and humid, and both spring and fall can expose concrete surfaces to repeated freeze-and-thaw cycles, one of the most damaging weather patterns concrete must endure. Winter snow is accompanied by sand and corrosive ice-melt chemicals. Although city boosters may have overstated the windiness of the Windy City, proximity to the Lake promotes constant air movement. In some areas, heavy traffic leaves a corrosive smoggy residue. A local company can help you identify and combat the worst effects of weather and assist you in finding an effective sealer.