5566成人精品视频免费_日韩三级电影网站_亚洲图片小说在线_激情伦成人综合小说_av一区二区三区在线观看_国产成人亚洲综合91_一区二区三区四区五区精品_99re6热在线精品视频播放速度_亚洲精品在线免费_午夜精品美女久久久久av福利

Guangzhou Steel tells you: steel blasting and painting method request

Guangzhou Steel tells you: steel blasting and painting method request

Steel rust coating method and requests?
[Guangzhou Steel answer] 1, rust grades should be based on the original state of the steel surface, the choice of primer, rust method used and other factors to determine the project cost.
2, when the use of hand-rust, rust quality level should not be less than the current national standard after treatment to the primed surface interval should not exceed 6h, during which surface should insist on a clean, non-wet, oil and the like. Guangzhou Steel