Rust-Oleum professional galvanizing compound spray contains a high loading of zinc used to touch-up damaged or weathered galvanized surfaces such as gutters and fences. Use on wrought iron and spot-welded metal, gutters, chain-link fences, and more. No top coat needed. Product features: Fast-drying, indoor/outdoor, durable, corrosion-resistant. 20 Oz. aerosol can covers approximately 40 Sq. Ft.