In terms of SANS 121 / ISO
1461 a galvanizer may repair a
coating by either zinc metal
spraying or zinc rich epoxy or
paint. The latter method must
conform to certain requirements
in the specification. The preferred
method of repair is by
zinc metal spraying. Repair will
only be necessary if bare spots
are present, usually caused by
inadequate cleaning, air entrapment
or if mechanical damage
has occurred.