... exquisitely by the technique of chemical pretreatment, rendering, and fine coating in the high-speed continuous machine. The painting is more ... /chromate-free treatment /untreated oiled,TENSION LEVELLERT SKIN PASS un-anti-fingerprint,Coating,colorApplicationStructural use ,roofing, corrugatedroofing, commercial use, householdappliance, industry, familySpecial ...