SECTION 59
PAINTING
446
a double layer of cheesecloth immediately prior to or during pouring into the spray
pot.
• An agitating spray pot shall be used in all spray application of zinc-rich primer.
The agitator or stirring rod shall reach to within 50 mm {2 inches} of the bottom of
the spray pot and shall be in motion at all times during primer application. The
motion shall be sufficient to keep the primer well mixed.
• Cured zinc-rich primer shall be free from dust, dirt, salt or other deleterious
deposits and thoroughly cured before applying subsequent coats.
59-2.14 MACHINE FINISHED SURFACES
• With the exception of abutting chord and column splices and column and truss
shoe bases, machine finished surfaces shall be coated with a rust inhibitor which
can be easily removed. Surfaces of iron and steel castings which have been
machine finished shall be painted with a coat of shop paint.
59-2.15 MACHINERY
• Prior to installation, all surfaces of machinery exposed to the atmosphere shall
be painted with 2 applications of unthinned zinc-rich primer (organic vehicle type)
conforming to the provisions in Section 91, "Paint." Unless otherwise specified in
the special provisions, the exposed surfaces shall be painted after installation with 2
finish applications of commercial quality gray gloss enamel. Aerosol cans shall not
be used.
59-2.16 PAYMENT
• Cleaning and painting structural steel will be paid for on the basis of lump sum
prices, unless otherwise specified in the special provisions.
• The lump sum prices paid for clean structural steel and for paint structural steel
or the lump sum price paid for clean and paint structural steel shall include full
compensation for furnishing all labor, materials, tools, equipment, and incidentals,
and for doing all the work involved in cleaning and painting structural steel as
shown on the plans, and as specified in these specifications and the special
provisions, and as directed by the Engineer.
59-3 PAINTING GALVANIZED SURFACES
59-3.01 GENERAL
• When galvanized surfaces are required to be painted, the surfaces shall be
cleaned and painted in conformance with the provisions in Sections 59-1,
"General," 59-2, "Painting Structural Steel," and this Section 59-3.
59-3.02 SURFACE PREPARATION
• Galvanized surfaces shall be steam cleaned.
• After steam cleaning, all areas shall be roughened by abrasive blasting using an
abrasive that is no larger than 600 µm {30 mesh}. Galvanizing shall not be
removed by this operation.
59-3.03 PAINTING
• Galvanized surfaces shall be covered with 2 separate applications of finish
coats as specified in the special provisions. Paint for the first application shall be
tinted by the manufacturer to slightly contrast with the color of the second
application.



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