Bare Spots/Coating Holidays
Gross
uncoated areas should be rejected. However,
small areas resulting from damage after galvanizing
may be repaired using an
acceptable repair compound. Some
of the causes of bare spots are:
1. Incomplete surface cleaning:
Remnants of paint, oil, grease, scale, or
rust cause uncoated areas; the molten zinc
does not bond to such residues. In cases
such as these the reinforcing steel is stripped
of the coating and re-galvanized
2. Welding slag: In assemblies
that have been welded, slag deposits from
welding procedures are resistant to the normal
cleaning solutions used in the galvanizing
process and must be mechanically removed.
3. Field Cutting: Galvanized
rebar may require to be cut in the field in
order to properly fit design specs.
Cut ends should be repaired accordingly.
Appearance
Blemishes
