Hot-dipped galvanizing is a long-lasting and cost-effective means of protecting steel from corrosion. There are, however, cases where paint or powder coatings are applied over galvanized steel to create what is known as a duplex system. A duplex system may be used as a means of adding color for aesthetics, camouflage, or safety; increasing the economic life of a structure; or increasing protection in very aggressive environments. Paint coatings can be applied soon after galvanizing, or later, when the galvanized coating has weathered....
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