|
Orange County Facility Renovations
<br />Hillsborough, NC
<br />
<br />Smith Sinnett PAINTING
<br />2020046/2020047/2020048/2020049/2020055 09 91 00 - 6
<br />3.2 PREPARATION
<br />
<br />A. General: Remove hardware and hardware accessories, plates, machined surfaces, lighting fixtures, and
<br />similar items already installed that are not to be painted or provide surface-applied protection prior to
<br />surface preparation and painting. Remove these items, if necessary, to completely paint the items and
<br />adjacent surfaces. Following completion of painting operations in each space or area, have items
<br />reinstalled by workers skilled in the trades involved.
<br />B. Cleaning: Before applying paint or other surface treatments, clean the substrates of substances that
<br />could impair the bond of the various coatings. Remove oil and grease prior to cleaning. Schedule
<br />cleaning and painting so dust and other contaminants from the cleaning process will not fall on wet,
<br />newly painted surfaces.
<br />C. Surface Preparation: Clean and prepare surfaces to be painted according to the manufacturer's
<br />instructions for each particular substrate condition and as specified.
<br />1. Provide barrier coats over incompatible primers or remove and reprime. Notify Architect in
<br />writing about anticipated problems using the specified finish-coat material with substrates
<br />primed by others.
<br />2. Cementitious Materials: Prepare concrete, concrete masonry block, cement plaster, and
<br />mineral- fiber -reinforced cement panel surfaces to be painted. Remove efflorescence, chalk,
<br />dust, dirt, grease, oils, and release agents. Roughen, as required, to remove glaze. If hardeners
<br />or sealers have been used to improve curing, use mechanical methods of surface preparation.
<br />3. Use abrasive blast-cleaning methods if recommended by the paint manufacturer.
<br />4. Determine alkalinity and moisture content of surfaces by performing appropriate tests. If
<br />surfaces are sufficiently alkaline to cause the finish paint to blister and burn, correct this
<br />condition before
<br />application. Do not paint surfaces where moisture content exceeds that permitted in
<br />manufacturer's printed directions.
<br />5. Wood: Clean surfaces of dirt, oil, and other foreign substances with scrapers, mineral spirits,
<br />and sandpaper, as required. Sand surfaces exposed to view smooth and dust off.
<br />a. Scrape and clean small, dry, seasoned knots, and apply a thin coat of white shellac or
<br />other recommended knot sealer before applying primer. After priming, fill holes and
<br />imperfections in finish surfaces with putty or plastic wood filler. Sand smooth when
<br />dried.
<br />b. Prime, stain, or seal wood to be painted immediately upon delivery. Prime edges, ends,
<br />faces, undersides, and backsides of wood, including cabinets, counters, cases, and
<br />paneling.
<br />c. When transparent finish is required, backprime with spar varnish.
<br />d. Backprime paneling on interior partitions where masonry, plaster, or other wet wall
<br />construction occurs on backside.
<br />e. Seal tops, bottoms, and cutouts of unprimed wood doors with a heavy coat of varnish or
<br />sealer immediately upon delivery.
<br />6. Ferrous Metals: Clean ungalvanized ferrous metal surfaces that have not been shop-coated;
<br />remove oil, grease, dirt, loose mill scale, and other foreign substances. Use solvent or
<br />mechanical cleaning methods that comply with recommendations of the Steel Structures
<br />Painting Council (SSPC).
<br />a. Blast steel surfaces clean as recommended by the paint system manufacturer and
<br />according to requirements of SSPC specification SSPC-SP 10.
<br />b. Treat bare and sandblasted or pickled clean metal with a metal treatment wash coat
<br />before priming.
<br />c. Touch up bare areas and shop-applied prime coats that have been damaged. Wire-brush,
<br />clean with solvents recommended by the paint manufacturer, and touch up with the
<br />same primer as the shop coat.
<br />7. Galvanized Surfaces: Clean galvanized surfaces with nonpetroleum-based solvents so that the
<br />surface is free of oil and surface contaminants. Remove pretreatment from galvanized sheet
<br />metal fabricated from coil stock by mechanical methods.
<br />
<br />
<br />DocuSign Envelope ID: 09980A3B-0691-41B4-854D-3865F2287392
|