Rust removal methods and coating requirements for steel structures?

1. The rust removal grade should be determined according to the original state of the steel surface, the primer selected, the rust removal method used, and the project cost. 2. When manual rust removal is used, the quality level of rust removal should not be lower than the current national standard. The time interval between surface treatment and primer application should not exceed 6 hours. During this period, the surface should be kept clean, and water and oil stains are strictly prohibited.