All baths have small particles in them from the process.  These particles galvanize and can float or sink in the zinc. When the zinc slowly runs off steel, it drops some of this dross that gets frozen in the surface zinc.  This is not detrimental to the coatings performance if they are covered in a layer of zinc.  Aesthetic concerns may make this unacceptable and this needs to be communicated prior to dipping by the fabricator.

rough, pimples, blisters, bumps

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