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. GARDZ is recommend for sealing problem porous surfaces. It is suitable for application to interior walls, ceilings and related surfaces. GARDZ will also adhere to and seal in old wallpaper paste and adhesive residue. GARDZ has a milky blue-white color that helps to determine where it has been applied, but dries water clear. Use directly from the container. Tinting is not recommended.