Crack filler is a specially formulated material used to repair and seal cracks in various surfaces such as concrete, asphalt, walls, and floors. It is an essential solution for maintaining structural integrity and preventing further damage caused by water, dust, or weather exposure. Crack fillers come in different forms—such as paste, liquid, or caulk—and are easy to apply with basic tools like putty knives or caulking guns. Once applied, they harden to form a durable, flexible seal that resists shrinking, cracking, or peeling. Whether for indoor use on walls and ceilings or outdoor use on driveways and pavements, crack fillers provide a quick, cost-effective fix that enhances appearance and longevity.