Paver sealing becomes necessary when pavers start to look dull, faded, or stained from oil, dirt, or mildew, or when sand between the joints begins washing away and weeds start pushing through. New paver installations also benefit from sealing soon after the cleaning process to lock in a fresh, vibrant finish. In Brooklyn, where seasonal rain, snow, and salt exposure can wear down unprotected pavers quickly, homeowners often schedule sealing every couple of years to prevent cracking, shifting, and costly repairs down the road.