This Product Is Easy To Work With & Apply By Hand & Provides A Smooth, Inert And High Quality Surface To Internal Walls And Ceilings, As Well As A Durable Base For Applying Decorative Finishes. Excellent Work Ability And A Reliable Setting Time. Approx. Setting Time Is 1.5 Hours Offers A Sound Insulation Improvement Of Up To 2dB For Some GypWall Systems Provides An Air tightness And Seals Gaps, Limiting Flanking Routes For Sound Transfer No Sanding Required One 25kg Bag Will Cover 10m2 At 2mm Thickness (Other Building Supplies Available)