coatings shall be removed.
f.
Chalk shall be removed so that when tested in accordance with ASTM
D 4214, the chalk resistance rating is no less than 8.
g.
Slick surfaces shall be roughened. Damaged areas such as, but not
limited to, nail holes, cracks, chips, and spalls shall be
repaired with suitable material to match adjacent undamaged areas.
h.
Edges of chipped paint shall be feather edged and sanded smooth.
i.
Rusty metal surfaces shall be cleaned as per SSPC requirements.
Solvent, mechanical, or chemical cleaning methods shall be used to
provide surfaces suitable for painting.
j.
New, proposed coatings shall be compatible with existing coatings.
][3.4.2
Existing Coated Surfaces with Minor Defects
[Sand, spackle, and treat minor defects to render them smooth. Minor
defects are defined as scratches, nicks, cracks, gouges, spalls,
alligatoring, chalking, and irregularities due to partial peeling of
previous coatings.] [Remove chalking by sanding [or blasting] so that when
tested in accordance with ASTM D 4214, the chalk rating is not less than 8.]
][3.4.3
Removal of Existing Coatings
Remove existing coatings from the following surfaces:
a.
Surfaces containing large areas of minor defects;
b.
Surfaces containing more than 20 percent peeling area; and
c.
Surfaces designated by the Contracting Officer, such as surfaces
where rust shows through existing coatings.
][3.4.4
Substrate Repair
a.
Repair substrate surface damaged during coating removal;
b.
Sand edges of adjacent soundly-adhered existing coatings so they
are tapered as smooth as practical to areas involved with coating
removal; and
c.
Clean and prime the substrate as specified.
]3.5
PREPARATION OF METAL SURFACES
3.5.1
Existing and New Ferrous Surfaces
**************************************************************************
NOTE: Surface preparation procedures should be
compliant with any local or base restrictions. For
cleaning or blasting ferrous surfaces, select
applicable options from the table below.
The considerations suggested here for painting over
existing paint are covered in a Coating Condition
Survey (CCS). Consult MIL-HDBK-1110 for details.
SECTION 09900
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