Synthetic Gypsum based rapid drying smoothing and repair compound suitable to provide a smooth finish on various substrates in interior areas. Schnox AST can be installed as a true featheredge. Compressive Strength: (ASTM C109mod-days air cure only): 23NMM sq 3600 psi at 28 days Coverage: Approx. 240 sq.ft. per unit when applied as a featheredge as a 33 lb bag at 116 Approx. 75 sq.ft. per unit when applied as a featheredge as a 10 lb bag at 116 Emicode: EC 1: very low emission Leed: IEQ 4.3 Low-Emitting Materials-Flooring Systems, 1 point MR 1.1 Building Reuse Maintain Existing Walls, Floors and Roof, up to 3 points MR 1.2 Building Reuse Interior-Maintain Existing Interior Nonstructural Elements, 1 point MR 4 Recycled Content, up to 2 points Pot Life: Approx. 20 minutes at 68F Ready for covering: After approx. 12 hours up to 18 layer-thickness Shelf Life: 1 year unopened Working Temperature: Not below 41F floor temperature