Murcos hypo-allergenic, Drywall Joint Compound is scientifically developed to create a superior finish that does not crack, shrink, or discolor even when used in the most extreme conditions. Its durability, easy application and ability to perfectly conceal surface flaws and dents make it the preferred choice to achieve the professional look you desire. Murcos line of hypo allergenic products meet or exceeds industry standards (ASTM standard C-475 and Federal specification SS-J-5709) and are specifically designed for the chemically-sensitive consumer.