coating material.]
[Apply paint to new fire extinguishing sprinkler systems including valves,
piping, conduit, hangers, supports, miscellaneous metal work, and
accessories. Shield sprinkler heads with protective coverings while
painting is in progress. Remove sprinkler heads which have been painted
and replace with new sprinkler heads. For piping in unfinished spaces,
provide primed surfaces with one coat of red alkyd gloss enamel to a
minimum dry film thickness of 0.025 mm 1.0 mil. Unfinished spaces include
attic spaces, spaces above suspended ceilings, crawl spaces, pipe chases,
mechanical equipment room, and space where walls or ceiling are not painted
or not constructed of a prefinished material. For piping in finished
areas, provide prime surfaces with two coats of paint to match adjacent
surfaces, except provide valves and operating accessories with one coat of
red alkyd gloss enamel. Upon completion of painting, remove protective
covering from sprinkler heads.]
a.
Drying Time: Allow time between coats, as recommended by the
coating manufacturer, to permit thorough drying, but not to
present topcoat adhesion problems. Provide each coat in specified
condition to receive next coat.
b.
Primers, and Intermediate Coats: Do not allow primers or
intermediate coats to dry more than 30 days, or longer than
recommended by manufacturer, before applying subsequent coats.
Follow manufacturer's recommendations for surface preparation if
primers or intermediate coats are allowed to dry longer than
recommended by manufacturers of subsequent coatings. Each coat
shall cover surface of preceding coat or surface completely, and
there shall be a visually perceptible difference in shades of
successive coats.
c.
Finished Surfaces: Provide finished surfaces free from runs,
drops, ridges, waves, laps, brush marks, and variations in colors.
d.
Thermosetting Paints: Topcoats over thermosetting paints (epoxies
and urethanes) should be applied within the overcoating window
recommended by the manufacturer.
e.
Floors: [For nonslip surfacing on level floors, as the
intermediate coat is applied, cover wet surface completely with
almandite garnet, Grit No. 36, with maximum passing U.S. Standard
Sieve No. 40 less than 0.5 percent. When the coating is dry, use
a soft bristle broom to sweep up excess grit, which may be reused,
and vacuum up remaining residue before application of the
topcoat.] [For nonslip surfacing on ramps, provide MPI 77 with
non-skid additive, applied by roller in accordance with
manufacturer's instructions.]
3.8.2
Mixing and Thinning of Paints
Reduce paints to proper consistency by adding fresh paint, except when
thinning is mandatory to suit surface, temperature, weather conditions,
application methods, or for the type of paint being used. Obtain written
permission from the Contracting Officer to use thinners. The written
permission shall include quantities and types of thinners to use.
When thinning is allowed, paints shall be thinned immediately prior to
application with not more than [0.125 L] [1 pint] of suitable thinner per
SECTION 09900
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