NCCER Painter key terms

A standardized document from the coating manufacturer that lists a product's hazardous ingredients, health effects, handling precautions, and first-aid steps. Employers must keep these sheets accessible to workers on every jobsite.

Wearable gear that shields a painter from jobsite hazards, such as respirators, safety glasses, gloves, hearing protection, and protective clothing. Selection is based on the hazards of the task and the products being used.

Systems and practices that prevent workers from falling from scaffolds, ladders, or elevated platforms. Common measures include guardrails, personal fall-arrest harnesses, and maintaining three points of contact on ladders.

A procedure for shutting off and locking energy sources such as spray equipment, compressors, or electrical panels before servicing, so the equipment cannot start unexpectedly and injure the worker performing maintenance.

Work practices required when disturbing paint in pre-1978 housing or child-occupied facilities. They include containment, dust control, worker training or certification, and cleaning verification to keep lead dust out of the living space.

A fan-and-filter unit that pulls air out of a contained work area and exhausts it through a HEPA filter, keeping dust and fumes from escaping into adjacent occupied spaces. It also holds the enclosure under slight negative pressure.

Trade math used to size surfaces to be coated: multiply length by height for rectangular walls, and add the lengths of all sides for perimeter. Accurate figures drive material quantities and labor estimates.

The material surface that receives the coating, such as drywall, wood, masonry, concrete, or steel. Its condition, porosity, and cleanliness determine which preparation steps and which primer the job requires.

The microscopic roughness created on a surface, usually by abrasive blasting, that gives the coating mechanical grip. Too little profile causes peeling; too much can leave peaks the coating cannot cover.

A preparation method that propels sand, grit, or other media at high velocity to remove rust, mill scale, and old coatings and to create a profile. SSPC/NACE standards classify the resulting cleanliness levels.

Sanding, scuffing, or applying a chemical etcher to dull a hard, shiny surface so a new coating can grip. It is required before recoating glossy enamel, tile, or factory-finished trim.

A vacuum fitted with a high-efficiency particulate air filter that traps fine dust, including lead and silica particles, instead of blowing it back into the room. It is used for final cleaning in containment work.

A spreadable material, such as joint compound, spackle, or epoxy filler, used to fill holes, cracks, and dents in a substrate before painting. It must be sanded smooth and primed so it does not show through the finish.

A unit of coating thickness equal to one thousandth of an inch (0.001 in.). Wet and dry film readings are recorded in mils to confirm the coating meets the manufacturer's specified film build.

The first coat applied to a prepared surface. It seals, promotes adhesion, blocks stains, and creates a uniform base for the finish coats, and it is formulated for the specific substrate being coated.

A coating that penetrates or covers a porous substrate to reduce absorption and stop the finish coat from soaking in unevenly. Sealers are common on bare wood, masonry, and new drywall.

The film-forming ingredient in a coating that holds pigment particles together and bonds them to the surface. The binder type, such as acrylic, alkyd, or epoxy, determines much of the coating's performance.

Solvent and chemical components that evaporate from a coating as it dries. Regulations set VOC limits by product category, and high-VOC products require ventilation and respiratory protection during use.

The amount of light reflected from a dried coating, ranging from flat through satin, semi-gloss, and gloss. Higher sheen is easier to clean but shows surface imperfections more clearly.

A number from 0 to 100 describing how much visible light a color reflects, with 0 as black and 100 as white. It helps painters and designers judge how light or dark a finished room will feel.

Two colors opposite each other on the color wheel, such as red and green. Mixing them neutralizes or dulls each other, a technique used for tinting and for correcting a color match.

Brushing a narrow, controlled band of coating along edges, corners, and trim before rolling the open field. It keeps the brush line straight and prevents roller marks against adjoining surfaces.

The length of the fibers on a roller cover, measured in inches or millimeters. Short nap suits smooth drywall; longer nap holds more paint and is used on rough masonry and stucco.

A spray unit that uses a high-pressure pump to force coating through a small tip, atomizing it without compressed air. It applies material fast and suits large flat areas and thick coatings.

The nozzle orifice size and the shape and width of the spray pattern it produces. Tip size must match coating viscosity, and the fan pattern determines overlap and coverage per pass.

High-volume, low-pressure spraying, in which a turbine or conversion gun delivers a large air volume at low pressure. It produces less overspray and bounce-back, making it common for fine finishes and cabinets.

Following a sprayed or initially rolled coat with a dry roller to even out the film, remove lap marks, and work paint into the surface. It is standard practice when spraying walls and ceilings.

A defect in which the dried film has a bumpy texture like citrus skin. Causes include coating viscosity that is too high, incorrect tip size or pressure, and holding the gun too far from the surface.

A translucent, slow-drying coating layered over a base coat and manipulated with brushes, rags, or sponges to create depth and texture. Glazes extend working time so the decorative effect can be shaped.

A decorative finish made from lime plaster applied in several thin, burnished coats. It cures to a hard, marble-like surface with subtle movement and depth.

A decorative technique in which rolled or bunched rags are pressed into and lifted off wet glaze to leave soft, mottled patterns. The result depends on rag texture, glaze color, and applied pressure.

Wallcovering pattern alignments. In a straight match, the design lines up horizontally across strips; in a drop match, alternate strips must be dropped to align, which increases waste.

Folding a pasted wallcovering strip paste-to-paste and letting it rest so the adhesive activates and the paper relaxes. Booking prevents the strip from stretching and improves adhesion.

A thin, clear coating applied to a wall before hanging wallcovering or painting. It seals the surface, controls absorption, and lets the wallcovering slide into position and be removed later.

A systematic count and measurement of all surfaces, openings, and trim to be coated, taken from drawings or from the actual site. The takeoff supplies the quantities used in the estimate.

The amount of surface a crew can prepare or coat in a given time, usually expressed in square feet per hour. It is adjusted for surface condition, height, access, and application method.

The area a given volume of coating covers at a specified film thickness, usually listed on the product data sheet in square feet per gallon. It is used to calculate how much material to order.

An allowance added to calculated material quantities to cover spillage, overspray, can residue, and touch-up. It is usually expressed as a percentage on top of the net measured quantity.

A written list of incomplete or defective work identified during a final walkthrough. The painter must correct each item and have it signed off before the job is accepted and final payment released.

Instruments that measure coating thickness. A wet film gauge is pressed into fresh paint to check coverage immediately; a dry film gauge reads the cured film to verify it meets specification.