DuROCK L5 Primer A vinyl acrylic-based coating designed for interior use over new drywall. Coverage: 500 to 600 sq. ft. per 18 L pail. Application: Replaces the need for the traditional skim and prime coat. Benefits: Hides minor surface defects and dries to a smooth finish, easy application with airless sprayer. DuRock L5 Primer is recommended for use when a L5 finish is required. The drywall has to be properly finished with the recommended joint sealer and all holes filled with joint compound, prior to priming. Data Sheet