Lock down porous and crumbling surfaces with Zinsser GARDZ problem surface sealer. Gardz repairs torn paper on damaged drywall, eliminates bubbles for new wallpaper application and works as sizing to protect new drywall. This low-odour, water-based formula dries to a clear, matte finish, creating a hard, paintable seal over damaged drywall, adhesive residues and other chalky surfaces. It penetrates, seals and binds unstable surfaces and has a mould and mildew resistant film once dry. Zinsser Primers by Rust-Oleum will get the job done the first time.