Below, find options to download a brochure and usage instructions for our KOLD-FLO® Gilsonite Modified Pourable Crack Filler. KOLD-FLO® Pourable Crack Filler is perfect for repairing many different kinds of concrete and asphalt surfaces. This modified asphalt emulsion product is great for patching driveways and pavement, repairing parking lots and concrete foundations, and fixing road and street cracks.