Zinsser Gardz® is a unique water-based sealer for potential problem surfaces. The specialist formula is designed to penetrate deeply and dry to a durable, moisture-resistant film that seals and stabilises porous substrates. Takes the ‘problem’ out of problem surfaces. Deeply penetrating, it dries to a rock-hard, water-resistant finish; this protects surfaces from damage during your next redecorating project. Recommended for damaged drywall, new drywall, filler and joint compound skim coats, plaster, calcimine, uncoated wallpaper, wallcovering adhesive residue, textured paint and more.