Sticker marks

The black squares seen are from stickers on the steel from the steel merchant.  The clear adhesive prevents the steel surface being cleaned and so it does not galvanize.  It is best to leave stickers on during fabrication so the area is easily seen and the sticker can be ground off prior to galvanizing.  This needs to be repaired and is the repsonsibility of the fabricator to advise the galvanizer that they exist.

black, squares, bare

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