Clean the crack thoroughly
Remove loose debris, dust, and old filler
Widen narrow cracks slightly if needed for better adhesion
Apply a concrete bonding agent if required
Fill small cracks with concrete crack filler or sealant
Use epoxy injection for structural cracks
Use polyurethane sealant for active or moving cracks
Patch larger cracks with a concrete repair mortar
Trowel the repair material smooth
Allow the repair to cure fully
Seal the repaired area to help prevent future cracking
Address the cause of the crack, such as drainage or settling
Resurface the concrete if multiple cracks are present