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Lock down porous and crumbling surfaces with Rust-Oleum Zinsser GARDZ Problem Surface Sealer. This low-odor water-based formula dries to a clear matte finish creating a hard paintable seal over damaged drywall adhesive residues and other chalky surfaces. Repairs torn paper on damaged drywall eliminates bubbles. Seals skim coats spackling. Protects new drywall. Seals old wallpaper adhesive. Easy to apply high spread rate fast drying. Water-base low odor dries clear. Apply liberally using a brush medium-nap roller or sprayer. Do not over-apply.