MIL-HDBK-1110
finish coats, if the alkyd finish coats are unavailable because
of environmental regulations. If the repaired area matches the
intact paint, it will not be necessary to topcoat the undamaged
areas.
If the existing finish coat
is urethane, epoxy, or
solvent insoluble, apply two coats of
epoxy primer and one coat
of aliphatic urethane finish. Again,
if the match is good,
topcoating of undamaged areas will be
unnecessary.
5.7.3
Galvanized Steel Guy Lines for Towers. Tall towers are
usually supported with galvanized steel stranded guy lines.
These are frequently coated with a commercial preservative
grease, as they are installed. These greases or pastes are most
frequently petroleum or drying oil products. Care should be
taken not to contaminate the guys before they are coated. Some
equipment is available for applying the grease after installation
of guys. Equipment for remote application is described in NCEL
Techdata Sheet 76-04. Galvanized steel anchor support systems
securing guys in place can also be protected by preservative
greases.
5.8
Waterfront Structures. The coating of steel waterfront
structures is described in NFGS-09967, Coating of Steel
Waterfront Structures. Coating systems are best applied in a
shop under controlled conditions. Systems which have provided
good protection have included abrasively blasting to a near-white
condition (SSPC SP 10) and application of one of the following
coating systems:
a) Epoxy polyamide system - e.g., three coats of
MIL-P-24441 starting with Formula 150 primer (each 3 mils dry
film thickness).
b) Coal tar epoxy-polyamide System - e.g., two coats
of SSPC PAINT 16 (each 8 mils dry film thickness).
Repainting or spot repairing coatings in or below tidal areas is
a real problem. Quick-drying lacquers that can dry between tidal
changes are not permitted at many locations because of VOC
restrictions. One approach to resolve the problem is to use a
cofferdam to apply suitable materials such as MIL-P-24441 or SSPC
PAINT 16 that can cure underwater. Another approach is to use
viscous splash-zone compounds that are applied manually or
thinner epoxy materials that can be applied underwater by brush,
roller, or pads.
5.9
Hydraulic Structures and Appurtenant Works. Coating of
hydraulic structures and associated pipe lines and equipment is
described in CWGS 09940, Painting: Hydraulic Structures and
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