Sealing a concrete sidewalk protects it against stains brought on by dirt, plants and organic debris, in addition to damage from chemicals and rust. Standard concrete is considered “fully cured” after about a month, however, it is important to follow your sealer manufacturer’s specified curing time.
Cured and Dry
Concrete continues to harden for many years after it is poured, but the standard period of initial curing is 28 days, or about one month. At this point, the concrete is very close to full strength and is prepared to accept most commercially accessible sealants. However, sealers typically must be implemented to dry concrete. It is possible to test the concrete for moisture content by securing a bit of aluminum foil on the sidewalk with duct tape and waiting 24 hours. If the foil is dry when you remove it, the sidewalk is prepared for sealing.