www.pavementpreservation.org- Asphalt Road Crack Filling Joint Sealing ,www.pavementpreservation.orgPavement Maintenance > Pavement Preservation & Maintenance ...TruFlex is a highly rubberized crack sealant designed for sealing cracks in asphalt or concrete pavements. TruFlex can also be mixed with sand for filling larger cracks and alligatored areas.