PolyFlex DS Rapid Concrete & Asphalt Crack Repair 21oz. Cartridge Plus GunPolyFlexDS repairs set up to a more flexible repair. PFDS is ideal where there is a lot of motion in the pavement. The polymer is a natural color and can be topped with gray or black sand to match your pavement. Make sure the crack is clean and free of moisture. If there is a lot of water, use a blow dryer or torch to make certain the crack is dry. Open cartridge and squeeze PFDS directly into the crack. Use a scraper or straight edge to smooth the