CGC Medium Texture Finish for Interior Ceilings Coverage: Up to 340 sq. ft. per bag. Application: Will bond to concrete, drywall, plaster, wood and metal piping (when primed). Interior use only. CGC Medium Texture Finish is formulated with a polystyrene aggregated ceiling texture in powder form; so, adding water, at the job site, is necessary. It can mask minor imperfections and has a superior resistance to fissure cracking when used at recommended thickness. Data Sheet