MIL-HDBK-1110
necessary to paint walls in the shade or at night during hot
weather. A minimum of 7 days should elapse between painting of
the pool and filling it with water.
5.15
Concrete Catchment Basins. Concrete catchments are
used by some activities with limited water supplies to collect
rainwater for both industrial and domestic use. The catchments
are usually sealed with a coating material and the joints caulked
with a flexible material to minimize water losses. Both of these
materials must be approved for potable water use, if the
collected water is to be for domestic use.
Thick cementitious coatings have been used
satisfactorily for many years to seal catchments. The Government
of Bermuda requires catchments to be free from unsightly mildew.
This is often a limiting factor there for cementitious coatings,
since their textured surfaces become mildew-defaced much sooner
than smooth coatings. Treatment with hypochlorite solution, as
described in par. 4.17, can restore mildew-defaced catchments to
a cosmetically pleasing appearance.
Acrylic latex elastomeric coatings have been found to
perform very well on concrete catchments. They provide excellent
resistance to water migration, weathering, and mildew. A primer
is usually required for good adhesion.
5.16
Chemically Resistant Finishes for Concrete Floors.
Chemically resistant urethane coatings (resistant to fuels and
hydraulic fluids) are sometimes used to impart improved lighting
to work areas such as under aircraft. Because of the smoothness
of these coatings, skid resistance is usually imparted by
sprinkling granules into the wet coating. Such a system is
described in A-A-50542, Coating System: Reflective, Slip-
Resistant, Chemical-Resistant Urethane for Maintenance Facility
Floors. A commitment to maintenance is essential when deciding
to coat a concrete floor. Cleaning and repair will be needed on
a frequent and regular basis to maintain the reflectivity and
appearance of the floors.
Chemical resistance may also be required for floors
where chemicals or hazardous waste is stored to permit rapid
neutralization and removal without contaminating other stored
materials. The coating should be chosen to be resistant to the
stored materials, so that it is best to consult the activity
industrial hygienist. Chemical-curing polyurethane or epoxy
systems as described for fuel tank interiors in par. 4.2.1 are
good candidates.
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