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Published byMarilynn Jacobs Modified over 9 years ago
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INTD 54 paint
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components of paint pigments—give color to coating binders—holds the pigments particles together; provide washability/scrubbability & durability solvents—make the coating wet enough to spread additives—perform special functions
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paint solvent-based: use petroleum derivative as solvent take longer to dry—solvent evaporation sometimes referred to as oil-based water-based: use water to make paint easier to spread sometimes referred to as latex, acrylic latex & vinyl acrylic adapt well to changing weather conditions—moisture less likely to build up
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paint several finishes/lusters available in alkyds or latex: flat—highest PVC; provide velvety appearance; little washability eggshell, pearl or satin—slightly lower PVC than flat; moderate scrubbability semi-gloss—mid-range sheen; good scrubbability gloss or high gloss—low-PVC; shiny surface; easy washability; shows imperfections enamel—generally used to indicate a higher quality paint; greater durability; smoother finish *PVC—pigment volume concentration
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stain also contain all four ingredients—have a unique binder which causes coating to penetrate deep into surface solid color stain—wood texture visible; hides grain; appears uniform semi-transparent—both texture and grain visible stain waxes—stain & wax in one process
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clear coating group of products that contain little or no pigments produce wet or shiny appearance provide an extra layer of protection urethane/polyurethane coatings form tough, hard, flexible chemically resistant films other finishes/coatings: varnish shellac lacquer danish oil
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primers first coat applied to substrate—prepares surface some also serve as sealers for porous substrates—wood, paper on gypsum board prevent waste of paint—absorption or deep colors flame-retardant paints not fireproof, do reduce flammability of substrate use wherever greater fire protection needed 0-25 flame spread rating required most commercial
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application methods best available equipment should be used—poor quality tools result in poor quality job brushes should have flagged bristles—load brush with more paint & help paint flow smoothly brushes—woodwork & uneven surfaces spraying—cover large areas; 8-10 times faster pads & rollers—do-it-yourself tools; remodeling without removing furnitur e
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surface preparation most important procedure to achieve good paint finish 80% of all coating failures—inadequate surface preparation until late 1970s lead-based paints were used—renovations of buildings painted before late 1950s must be done by contractor trained in proper handling
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surface preparation wood—moisture; all cracks & nail holes filled; sanding plaster—must be solid; no cracks; smooth and level gypsum board—seams must be taped; nail/screw holes set & filled with spackle; filled areas sanded; brushed clean of particles before priming metal—loose rust & paint removed before painting (sandblasting) masonry—use block filler due to porous surface; masonry paint covers less surface than other types
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writing paint specifications way of legally covering both parties in the contract—no misunderstandings of responsibility if scope is clearly written out time requirement most important—penalty surface preparation high-performance paints method of application inspections cleanup
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