Gardner blacktop crack & joint filler is a fast drying, commercial grade, high performance Rubberized compound for use in the repair of blacktop roads, driveways, pavements, expansion joints and walkways. Speeds up seal coating jobs with quick drying. Crack filler provides a long term repair on cracks and joints up to 1 inch wide. Its non-shrink formula seals and waterproofs as well as providing a flexible seal.