KOLD-FLO Gilsonite Modified Cold Applied Pourable Crack Filler is formulated with special polymers and additives to seal out water, protect, and preserve asphalt and concrete pavements. It is designed to fill cracks and joints on any paved asphalt or concrete surface including driveways and parking lots. KOLD-FLO crack filler can be applied to cracks from hairline to 1 in. wide.