CGC Synko® All Purpose Compound (Mud) Coverage: For joint finishing, the 17 L box covers approx. 450 ft.2 (42 m2) of gypsum panels. Application: For applying paper joint tape and paper-faced corner bead, filling (2nd coat), finishing (3rd coat), skim coating, simple textures and repairs. Synko® All Purpose Compound (Mud) is easy to apply and provides a smoother finish. While Classic Finish® should not be used to affix paper tape or all metal corner bead, it can be used for all 3 coats on paper-faced metal corner bead. Data Sheet