After PVC coat process, black or galvanized welded mesh can be with high corrosion resistance. Especially , the galvanized welded mesh is coated with two layers of PVC and Zinc which is tightly bonded to the wire by a heat process. They are double protection. Not only does the vinyl coating seal protect the wire from water and other corrosive elements, but also the underlying mesh is also protected by good zinc coating. PVC coat make the welded mesh longer working life, and more beautiful with different colors.