moisture as determined by sight and touch. Metallic coatings shall not be
applied to surfaces upon which there is detectable frost or ice.
Metallized coatings shall not be applied when ambient and surface
temperatures are below, or expected to drop below the minimum application
temperature prior to completion of metallizing and curing of the sealer and
paint. The minimum application temperature shall be [_____] degrees C
degrees F. During periods of inclement weather characterized by extremes
of humidity and temperature, metallizing may be continued by enclosing the
work area and providing conditioned air, provided the proscribed ambient,
surface, and dew point temperatures are maintained.
3.2.6
Time Between Surface Preparation and Metallizing
Surfaces that have been prepared and approved for metallizing shall receive
the first coat of metallic coating as soon as practicable after such
preparation has been completed. The first coat shall be applied prior to
the appearance of flash rust or within 4 hours of abrasive blasting,
whichever is sooner.
3.2.7
Time Between Metallizing and Painting
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NOTE: Dry time prior to immersion if applicable,
should be in accordance with the painting schedule.
There is no dry time associated with thermal-spray
coatings. A brief cool-down period prior to
painting is necessary and may be addressed in the
painting schedule by specifying a maximum
temperature for surfaces to be sealed.
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Approved sections of metallizing shall be sealed as soon as practicable
after completion of metallizing. The sealer shall be applied prior to the
appearance of condensation on the receiving surfaces or within 8 hours of
completion of metallizing, whichever is sooner. In no case shall
metallized coatings be allowed to become contaminated prior to application
of sealers. Subsequent paint coats shall be applied in a timely manner
consistent with the painting schedule.
3.2.8
Approved Methods of Metallizing
Metallizing methods which employ metal wire feed stock with oxygen-fuel gas
flame spray or electric-arc spray that produce coatings in conformance with
requirements of this specification are acceptable.
3.3
FIELD INSPECTION
3.3.1
Quality Control Inspection and Testing
The qualified Coating Inspector shall be present during all work phases.
The Coating Inspector shall perform and document all of the tests and
inspections in paragraphs Ambient Conditions Inspection, Presurface
Preparation Inspection, Surface Preparation Inspection, and Metallized
Coating Inspection.
3.3.1.1
Ambient Conditions Inspection
Ambient air and surface conditions shall be monitored and documented by the
Coating Inspector before and during all work phases. The conditions of
SECTION 09971A
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