This was a large flat iron roof with extensive surface rust. Following a high-pressure water clean the rust was treated with a “Rust Encapsulator” – Rust Encapsulator can be applied over lightly rusted metal, or even clean bare metal, and seals it from moisture and corrosion. … The encapsulator flows into hard to reach spots, penetrates deep into the rust, and even fills in minor pinholes and surface imperfections – Following this the roof was sprayed with a galvanized metal primer to further provide ongoing rust protection. Finally the roof was coated with 2 coats of Dulux Cool Roof Surfmist to provide summer sun protection.