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Repairing the Zinc Coating
The area adjacent to the arc or gas weld will be free of zinc because of the high temperature of the weld. To produce a corrosion-resistant joint, the zinc must be replaced in this area and on the weld itself unless the nonferrous filler metal was used.
There are several ways of replacing the zinc. One is by the use of zinc base paste sticks sometimes called zinc sticks or galvanized sticks sold under different proprietary names. These sticks are wiped on the heated bare metal. With practice a very good coating can be placed which will blend with the original zinc coating. This coating will be thicker than the original coating, however.
Another way of replacing the depleted zinc coating is by means of flame spraying using a zinc spray filler material. This is a faster method and is used if there is sufficient zinc coating to be replaced. The coating should be two to two-and-one-half times as thick as the original coating for proper corrosion protection.
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