Duplex systems, such as paint or powder coating over hot-dip galvanized steel, have been used for years as a means to enhance corrosion protection.  Powder coating over hot-dip galvanized steel provides the owner/specifier with effective corrosion protection, while still allowing the structure to achieve a desired color or aesthetic. Duplex systems are becoming increasingly common and popular because of this combination of benefits. Additionally, specifiers may opt to powder coat rather than paint to avoid expending the environmentally detrimental volatile organic compounds (VOC’s) present in liquid paints.

Successfully powder coating over hot-dip galvanized steel is relatively simple. Similar to the paint over galvanizing process, proper surface preparation is key to creating an effective bond between the powder coating and the galvanized surface. Galvanized steel requires slightly different preparation steps according to the surface condition.  Thus, proper preparation relies on correctly identifying the galvanized surface condition, and then following the appropriate cleaning and profiling steps to achieve optimum bonding of the powder coating to the hot-dip galvanized steel.

Created in 2013, this package includes an instructional guide booklet and step-by-step DVD video on how to prepare the hot-dip galvanized steel surface for powder coating.