Sheetrock Pre-Mixed Ultra Lightweight All-Purpose Drywall Joint Compound Up to 40% lighter than conventional-weight joint compound. Provides overall high performance, as well as superior working qualities and good open time. Special latex formulation is ideal for embedding Sheetrock paper joint tape and for filling, leveling and finishing over gypsum panel joints, fasteners, bead and trim. Delivers a tough finish, yet sands easily. Easier flow and less effort during application. Flexible enough to use with hand tools or mechanical finishing equipment. Ready mixed. Coverage 2 4.5 Gal. gallon pails finishes 1000 Sq. Ft. square foot gypsum wallboard. Size 4.5 Gal., Pre-Mixed Yes, Set Time 24 Hr., Coverage Area 500 Sq. Ft., Shelf Life 9 Mo., Pkg Qty 1, Package Type Pail