SECTION 09971 EXTERIOR COATING OF STEEL STRUCTURES (cont.) -99710005

coating system is ideal for repairing and coating of

galvanized surfaces. Repair galvanizing with the

zinc-rich primer, and apply general coats of

intermediate and topcoat to all surfaces.

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NOTE: This specification should be edited by

personnel familiar with protective coatings and

coating specifications. Completion of SSPC Course

"C-1 Fundamentals of Protective Coatings For

Industrial Structures," or equivalent, is considered

a minimal qualification, along with appropriate

specification writing experience.

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NOTE: This guide specification complies with the

intent of Air Force ETL 86-4, as revised on 28

April, 1999 to eliminate the "second primer coat."

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NOTE: The metric standard for measuring coating

thickness is microns (25.4 microns=1 mil - use

nominal 25 microns=1 mil).

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NOTE: This specification is for an industry

standard, 3 Coat, thin film, coating system that is

compliant with EPA VOC regulations as of June 2000:

- Epoxy coats 350 g/l 2.8#/gal max. VOC

- Polyurethane Topcoat 350 g/l 2.8#/gal max. VOC

The designer shall review state and local,

regulations and determine whether the coating in

this Section complies with restrictions on volatile

organic components (VOC) and other chemical

constituents.

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NOTE: Previous versions of this specification have

included a requirement for surfaces to be abrasive

blasted to SSPC SP 7, inspected, and repaired, prior

to coating. That requirement has been removed from

this specification, and if required for a repair

project, it should be included in the structural

repair Section of the project specification. Tailor

the paragraph to the needs of cleaning that will be

required in preparation for repairs, and note that

the abrasive blasting for inspection should be

accomplished in such a manner that it does not

conflict with any surface condition requirements in

this Section, such as creating excessive surface

profile that may require excessive primer thickness.

For repair projects, specify appropriate portions

SECTION 09971

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