Setting-type compound (Durabond, EasySand): powder mixed with water, sets by chemical reaction (calcium sulfate hemihydrate). Set times: 20, 45, 90, 210 minutes. Advantages over drying compound: faster (multiple coats per day), harder, less shrinkage, bonds to any substrate (concrete, wood, metal, previous compound). Uses: embedding tape (first coat), filling large voids, high-build areas, cold/humid conditions where drying compound won't dry. Disadvantages: difficult to sand when fully cured (EasySand easier than Durabond), must mix fresh each time, short working time. Mix: powder to water (not water to powder), mix to peanut-butter consistency. Clean tools immediately. CSI 09 29 00. Cost: $8-$15/bag (18-25lb covers 50-75 sf tape coat).