Super Skin Systems JointSeal Flex is a 2-component 100% solids, zero VOC, elastomeric polyurea sealing system designed to act as a crack filler for use with large to small to large cracks in concrete, masonry and other cementitious substrates. This material provides exceptional adhesion characteristics and fast cure times. It is highly chemical resistant, insensitive to water, abrasion resistant and remains thermally stable in a range of -20°F (-29 C) to 250°F (125 C). It may be used under traditional floor coatings or any of our top-coating materials. Joint Seal is used in heavy traffic warehouse floors, refrigeration floors, chemical spill prone floors, pothole road repair or under ceramic tile floors. Joint seal is also designed to be used on expansion joints.