CGC Durabond® 90 Setting-Type Joint Compound Coverage: Approx. 500 sq. ft. per bag (72 lb. per 1000 sq.ft.) Setting Time: 85 to 130 minutes. Application: As an Interior/Exterior joint compound, a laminating agent, as well as filling, smoothing and finishing concrete ceilings. CGC Durabond® 90 Setting-Type Joint Compound is a non-asbestos containing, chemically setting powder for same day joint finishing and next day decorating. The mud can be used on approved exterior ceiling panels, in heavy fills and is virtually unaffected by humidity. Durabond® 90's special formulation provides a high strength bond with low shrinkage that finishes with a hard, plaster-like surface when dry. Data Sheet