A unique clay-based restoring system for acoustic ceiling tiles, this product permanently bonds to the surface being restored without compromising acoustical sound absorption or fire retardant value. It also covers water stains, smoke and fire damage, graffiti, paint, ballpoint ink, permanent marker and rusting nail heads. And it leaves a clean, white coating and works as a non-bleeding primer/sealer for sign painters, a non-grain-raising primer for new wood, a base coat for wallpaper or vinyl wall coverings, and as a base coat for galvanized metal. 12 oz aerosol. 12/Case.