Zinsser gardz sealer primer is a clear water based acrylic resin sealer that penetrates deeply into porous surfaces it dries fast and forms a hard moisture proof film that prevents drywall blistering and bubbling it binds down chalky surfaces strengthens soft texture finishes and seals in residual wallpaper paste gardz sealer primer can be applied to high ph surfaces and is easily cleaned up with soap and water recommended uses damaged drywall prevents bubbles that form when damaged drywall is