CGC Synko® Pro Series Fill and Finish Coverage: For joint finishing, the 17 L box covers approx. 450 ft.² (42 m²) of gypsum panels. Application: The fill (2nd coat) and finish (3rd coat) coats in drywall finishing. Synko® Pro Series Fill and Finish Compound (Mud) is easy to apply and sand. It has professional grade features including superior consistency, excellent crack resistance and less shrinkage. Synko® Pro Series Fill and Finish should not be used as the first coat. Data Sheet