This is my first experience with "Rust No More". I will know how well it protects my diamond plate deck in another year. The deck is covering an underground reservoir at our facility. Using a roller, I found that I actually get about 144 sq. ft. of coverage per gallon. One gallon was covering three 4' x 12' plates when applying it per the directions. So a second coat was another gallon of paint. I sure hope that it is worth it! It looks like a good primer when it is dry.