Zinsser Gardz Problem Surface Sealer is a clear, water-based acrylic resin sealer designed for interior application to porous surfaces prior to painting, texturing or wallcovering. It is recommend for sealing problem porous surfaces such as bare or damaged drywall, plaster, cement and cementitious coatings, spackling paste and joint compound, calcimine, stucco, acoustic and texture finishes and uncoated wallpaper.