listings of expected relationships between binder
types are given in MPI Evaluation of systems,
"Transition Coat and Architectural Paint
Compatibility Chart". Consult coating specialist
codes regarding questionable compatibilities
indicated in the chart.
d. For some maintenance operations, use of ASTM D
5064, "Standard Practice for Conducting a Patch Test
to Assess Coating Compatibility," may be warranted.
Interpretation of the results of patch testing is
not always straight-forward, therefore, consult
appropriate coating specialists when considering
patch testing.
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Remove dirt, splinters, loose particles, grease, oil, [disintegrated
coatings,] and other foreign matter and substances deleterious to coating
performance as specified for each substrate before application of paint or
surface treatments. Oil and grease shall be removed prior to mechanical
cleaning. Cleaning shall be programmed so that dust and other contaminants
will not fall on wet, newly painted surfaces. Exposed ferrous metals such
as nail heads on or in contact with surfaces to be painted with
water-thinned paints, shall be spot-primmed with a suitable
corrosion-inhibitive primer capable of preventing flash rusting and
compatible with the coating specified for the adjacent areas.
[3.4.1
Additional Requirements for Preparation of Surfaces With Existing
Coatings
**************************************************************************
NOTE: Delete inapplicable phrases or entire
paragraph if no previously painted surfaces will be
encountered.
**************************************************************************
Before application of coatings, perform the following on surfaces covered
by soundly-adhered coatings, defined as those which cannot be removed with
a putty knife:
a.
Wipe previously painted surfaces to receive solvent-based
coatings, except stucco and similarly rough surfaces clean with a
clean, dry cloth saturated with mineral spirits, ASTM D 235.
Allow surface to dry. Wiping shall immediately precede the
application of the first coat of any coating, unless specified
otherwise.
b.
Sand existing glossy surfaces to be painted to reduce gloss.
Brush, and wipe clean with a damp cloth to remove dust.
c.
The requirements specified are minimum. Comply also with the
application instructions of the paint manufacturer.
d.
Previously painted surfaces [specified to be repainted] [damaged
during construction] shall be thoroughly cleaned of all grease,
dirt, dust or other foreign matter.
e.
Blistering, cracking, flaking and peeling or other deteriorated
SECTION 09900
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