... projects of petroleum, petrochemical industry, city gas, oil and gas storage and transportation, power, water supply, metallurgy, civil aviation, etc. 1.1 ... Grade and Rust-removal Grade, and it shall be dust-free.2.2 Priming Primer shall be stirred well before painting ... the steel surface that is rust-removed completely and dust-free. After the primer dries up (one may feel no sticky ...