This guide describes one method for repairing galvanizing or inorganic zinc coating using an organic zinc-rich coating. ASTM A 780 briefly describes this and other alternative methods (metallizing and zinc-based solders) for repair of damaged and uncoated areas of hot-dip galvanized coatings.
This method is intended to repair imperfections resulting from application, welding, cutting, drilling, grinding, abrading, or rough handling during transport or erection. It may also be used to repair imperfections in galvanizing or inorganic zinc coating that have occurred from weathering during storage or after erection.
This method can also be used to repair topcoated galvanizing or inorganic zinc coating.
This method consists of selecting organic zinc-rich coatings and topcoats and preparing and applying the coatings to damaged galvanizing or inorganic zinc coating.
This method is intended for repairing localized imperfections where the major portion of the existing zinc coating is intact.
Organic zinc-rich coatings are suitable for repairing damaged zinc coatings because they combine several favorable properties. They can be readily applied by brush or spray under field conditions to small and irregular shapes and are compatible with both zinc and steel substrates.
