Putty or wood filler shall be compatible with subsequent coatings.
3.8.5
Wood Preservative
Areas of bare wood in exterior locations prone to excessive moisture or
standing water shall be treated with a commercial, fungicide, paintable
water repellant/preservative. Water repellant/preservatives shall not be
used on interior surfaces.
3.9
METAL SURFACES
Metal surfaces shall be cleaned of foreign matter. Programs for
preparation of metal shall be per SSPC PA Guide 5. Grease, oil, and other
soluble contaminants shall be removed by solvent cleaning per SSPC SP 1.
Surfaces shall be free from soils and corrosion; e.g. grease, oil, solder
flux, welding flux, weld spatter, sand, rust, scale, and other contaminants
that might interfere with the application of the new finish. Cleaning
methods shall be the gentlest possible to achieve the desired result.
Metals which are soft, thin, or exhibit fine detail shall not be abrasively
cleaned. Evidence of corrosion or contamination on a previously cleaned
surface shall be cause for recleaning prior to painting.
3.9.1
Ferrous Surfaces
Ferrous surfaces that contain loose rust, loose mill scale, and other
foreign substances shall be cleaned mechanically with hand tools according
to SSPC SP 2, power tools according to SSPC SP 3 or by blast cleaning
according to [SSPC SP 5], [SSPC SP 6], [SSPC SP 7], [SSPC SP 10].
Shop-coated ferrous surfaces shall be protected from corrosion by treating
and touching up corroded areas immediately upon detection.
3.9.2
Nonferrous Metallic Surfaces
Galvanized, aluminum and aluminum-alloy, lead, copper, and other nonferrous
metal surfaces shall be solvent-cleaned in accordance with SSPC SP 1.
3.9.2.1
Aluminum
Aluminum surfaces shall be treated per ASTM D 1730 or ASTM D 1731. Steel
wool, steel brushes and uninhibited caustic etching solutions, such as
sodium hydroxide, shall not be used on aluminum.
3.9.2.2
Zinc
Zinc surfaces including zinc-coated substrates, shall be cleaned prior to
painting as follows: degrease, soak in a mild and inhibited alkaline
cleaner, rinse with clean overflowing water, clean anodically in an acid
(e.g. 0.25 to 0.75 percent sulfuric acid), and rinse with clean overflowing
water.
3.10
TIMING
Surfaces that have been cleaned, pretreated, and otherwise prepared for
painting shall be given a coat of the specified first coat as soon as
practical after such pretreatment has been completed, but prior to any
deterioration of the prepared surface. Unless otherwise directed, the
first coat primer shall be applied within 48 hours of surface preparation.
SECTION 09995
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