SHEETROCK® Easy Sand™ 45 lightweight setting-type joint compound is a chemically-setting compound for interior gypsum panels and exterior gypsum ceiling boards. It has an approximate set time of 45 minutes. This product can be used for a variety of applications including: filling, smoothing, and finishing interior concrete ceilings and above-grade concrete; taping and finishing panels in bathroom areas; and finishing joints in protected exterior soffits.