CGC Sheetrock® Machine Mud® Drywall Compound Coverage: Approx. 220 sq. ft. per box (10 gal. per 1000 sq. ft.). Application: All stages of drywall finishing. CGC Sheetrock® Machine Mud® Drywall Compound is a lightweight, high performance compound that is used primarily by mechanical tool users. Machine Mud®, which can also be applied by hand, is formulated so fewer passes are required to create a smooth surface. When taping, a slight thinning with water may be required. Data Sheet