CSLB C-33 Painting & Decorating flashcards

The process of abrading dried joint compound to achieve a perfectly smooth and seamless surface on drywall before priming and painting.

• Removes ridges, bumps, and tool marks.
• Ensures a uniform texture for paint.
• Typically done with fine-grit sandpaper or sanding screens.

Memory trick: Mud smooth, then prime to seal.

The precise proportion, usually by volume or weight, in which the base and hardener (or activator) components of a two-part coating system must be combined to ensure proper chemical reaction and curing.

• Crucial for achieving specified coating properties and performance.
• Incorrect ratios can lead to incomplete curing, soft spots, or brittle films.
• Always follow the manufacturer's technical data sheet (TDS).

Memory trick: Ratio rules the mix, for perfect coating fixes.

The drying of solvent-based coatings primarily involves the evaporation of solvents, a process greatly influenced by air circulation, temperature, and humidity.

• Good air movement speeds up solvent evaporation.
• Higher temperatures generally accelerate drying.
• High humidity can slow drying by reducing the evaporation rate of some solvents.

Memory trick: Air, heat, humidity, film: the dry-time team.

A ready-to-use compound for filling small holes, cracks, and imperfections on interior walls and ceilings before painting.

• Dries quickly and sands easily.
• Ideal for gypsum board and plaster.
• Not suitable for large structural repairs.

Memory trick: Light, Quick, Smooth: The Spackle Rule for Gypsum.

DFT specifications define the required thickness of a coating after it has dried. For multi-coat systems, both individual coat DFTs and total system DFT are critical for performance and longevity.

• Too thin a coat compromises protection.
• Too thick a coat can lead to cracking, solvent entrapment, or slow curing.
• Individual coat DFTs are as important as total DFT for multi-coat systems.

Memory trick: Each coat's a must, for total trust.

The use of specific primers to prevent natural wood extracts (tannins) from migrating through paint films, causing discoloration.

• Common with cedar, redwood, and other 'bleeding' woods.
• Requires oil-based or shellac-based primers.
• Water-based primers are generally ineffective.

Memory trick: Tannins seep, oil-prime deep.

An oil-based (alkyd) primer formulated to seal and prevent the bleed-through of severe stains such as water, smoke, grease, and tannins from wood, providing a clean surface for topcoats.

• Superior sealing properties compared to most water-based primers.
• Effective on a wide range of challenging stains.
• Requires mineral spirits for cleanup and typically has strong odors.

Memory trick: For tough stains, oil-based is the king, preventing any bleed-through sting.

Induction time is a mandatory waiting period after mixing two-component coatings, allowing initial chemical reactions to occur, ensuring proper cross-linking, and achieving optimal film properties.

• Crucial for proper chemical cure and film performance.
• Allows solvents to equilibrate and resins to react.
• Skipping or shortening leads to compromised hardness, chemical resistance, or adhesion.

Memory trick: Give the chemicals time to meet and greet, for a coating that's really neat.

Pot life is the amount of time a multi-component coating remains workable after its components have been mixed, before it starts to gel or harden. It is significantly affected by temperature.

• Higher temperatures reduce pot life.
• Lower temperatures extend pot life.
• Mixing larger batches can also generate heat, further reducing pot life.

Memory trick: Hot pot, short shot; cool pot, long work slot.

A coating defect where atomized paint particles dry in the air before reaching the substrate or a wet film, resulting in a rough, dull, and textured finish.

• Common with fast-drying paints or high temperatures/airflow.
• Caused by spraying too far from the surface or insufficient atomization.
• Leads to poor adhesion and aesthetics.

Memory trick: Spray too far, dry in the air, a rough coat, no repair.

A spray pattern characterized by heavy edges and a weak or open center, indicating inadequate atomization of the coating material, often due to insufficient spray pressure.

• Caused by too low pressure for the material's viscosity.
• Results in uneven coverage and poor finish quality.
• Corrected primarily by increasing spray pressure or, if necessary, thinning or using a larger tip.

Memory trick: Fingers mean pressure's low, make the paint flow!

Galvanized metal requires specialized primers, such as zinc-rich or DTM acrylics, to ensure proper adhesion and prevent chemical reactions that lead to coating failure.

• Galvanized surfaces are reactive.
• Zinc-rich primers offer cathodic protection.
• Avoid standard alkyd primers on new galvanized.

Memory trick: Galvanized needs Zinc's zeal, not just basic peel-proof deals.

The thickness of a coating film after all volatile components have evaporated, calculated by multiplying the wet film thickness (WFT) by the percentage of solids by volume.

• DFT = WFT × % Solids by Volume.
• Crucial for coating performance, protection, and longevity.
• Measured with a dry film thickness gauge after curing.

Memory trick: Wet film's solids dictate dry film's true size.

A material used to fill small holes, cracks, and imperfections in wood surfaces, providing a smooth base for painting or staining.

• Dries hard and can be sanded.
• Accepts paint or stain.
• Available in various colors to match wood.

Memory trick: For wood's small flaws, 'putty' is the perfect cure.

A putty-like material used to fill small holes, cracks, and surface imperfections in interior walls and ceilings before painting.

• Dries quickly and sands easily.
• Ideal for hairline cracks and nail pops.
• Provides a smooth, paintable surface.

Memory trick: Small flaws? Spackle smooth, then paint.

CSP is a standardized measure (from 1 to 10) of the roughness of a concrete surface, crucial for ensuring proper mechanical adhesion of coatings, sealers, and overlays.

• Achieved by mechanical methods: grinding, shot blasting, scarifying.
• Manufacturer specifies required CSP for optimal coating performance.
• Verified using CSP comparator chips (ICRI GUIDELINE 310.2R).

Memory trick: Measure the bumps, or your coating will jump!

The process of preparing smooth, glossy PVC (polyvinyl chloride) surfaces to ensure proper paint adhesion.

• Scuff sanding is critical for mechanical adhesion.
• Cleanliness is also essential.
• Use primers designed for plastics for best results.

Memory trick: Glossy PVC needs a 'scuff' to make the paint tough.

Small, circular craters in a coating film that extend down to the substrate, often caused by trapped air or outgassing from porous substrates like concrete.

• Common in high-solids coatings on concrete.
• Caused by air escaping from the substrate as the coating cures.
• Prevented by proper surface preparation (e.g., shot blasting, filling bug holes) and sometimes a 'scratch coat' or primer.

Memory trick: Moon craters on the floor, air escaping, that's the core.

Wet Film Thickness (WFT) is the thickness of a coating immediately after application, calculated by dividing the desired Dry Film Thickness (DFT) by the coating's percent solids by volume.

• WFT = DFT / (% Solids by Volume).
• WFT is always greater than or equal to DFT.
• Measured with a wet film comb/gauge during application.

Memory trick: WFT is DFT divided by solids, a clear path to follow.

The process of physically removing all non-adhering paint from a substrate to prepare it for a new coating.

• Crucial for new paint adhesion.
• Methods include scraping, wire brushing, sanding.
• Followed by feather-edging for smooth transitions.

Memory trick: Sound surface, lasting finish.

Chemical solutions designed to remove tough contaminants like grease, nicotine, and heavy grime from surfaces before painting.

• TSP and its substitutes are common examples.
• Essential for proper adhesion of new paint.
• Requires proper ventilation and personal protective equipment.

Memory trick: Grease and grime need a 'TSP' touch to shine.

A high-solids primer designed to fill porous and textured masonry surfaces, such as concrete blocks, creating a smooth, uniform base for topcoats.

• Reduces paint absorption into porous substrates.
• Improves final finish appearance and paint adhesion.
• Essential for achieving a smooth finish on rough surfaces.

Memory trick: Rough blocks need a 'block filler' to be smooth.

The essential process of completely eliminating all residual wallpaper adhesive from a wall surface before painting or re-wallpapering.

• Crucial for proper paint adhesion.
• Adhesive removers or warm water/vinegar solutions are common.
• Failure to remove leads to bubbling, peeling, or uneven finish.

Memory trick: Glue gone, then prime, or your paint will moan.

Small, stable cracks in stucco are best repaired with flexible, paintable acrylic elastomeric caulk or filler to accommodate movement and prevent recracking.

• Stucco is a dynamic surface.
• Flexibility prevents recracking.
• Elastomeric products are designed for movement.

Memory trick: Stucco's small splits need flexible fills, not rigid cement's ills.

'Rain-safe' time is the minimum period a coating needs to dry or cure sufficiently to withstand exposure to rain without damage or adverse effects on its appearance or performance.

• Crucial for exterior coatings, especially stains and certain paints.
• Always follow manufacturer's specifications.
• Environmental factors (temp, humidity) can extend this time.

Memory trick: Don't rush the rain, or you'll feel the pain.

The viscosity of alkyd (oil-based) paints can be adjusted to improve brushability and flow by using appropriate paint thinners or flow additives specifically designed for oil-based coatings.

• Use mineral spirits, naphtha, or specific alkyd paint thinners.
• Flow additives improve leveling and reduce brush marks.
• Never use water with oil-based paints.

Memory trick: Thick paint needs the right drink to flow, or brush marks will surely show.

Airless spray tips wear out over time due to the abrasive nature of paint, leading to an enlarged orifice and a wider, less defined spray pattern, often with 'tails' and increased overspray.

• A worn tip increases paint consumption.
• It reduces transfer efficiency.
• It produces a poor finish quality (tailed pattern, uneven coverage).

Memory trick: If your spray is stray, look at the tip today.

A primer formulated with antimicrobial additives (fungicides/mildewcides) to prevent the growth of mold and mildew on the paint film, especially in high-humidity areas.

• Crucial for bathrooms, kitchens, basements.
• Does not kill existing mold, only prevents future growth.
• Must be applied to a clean, mold-free surface.

Memory trick: For damp walls, only 'mold-resistant' primer can win.

Oil-based and shellac primers dry through a combination of solvent evaporation and oxidative polymerization, processes highly dependent on ambient temperature and air circulation.

• Low temperatures significantly slow drying and curing.
• Good ventilation aids solvent evaporation.
• High humidity can also retard drying, especially for solvent-based paints in some climates.

Memory trick: Cold air and no flow make the paint's dry glow incredibly slow.

The 'dew point rule' states that the substrate temperature must be at least 5°F (3°C) above the dew point temperature to prevent condensation from forming on the surface during coating application.

• Condensation on the substrate severely compromises coating adhesion.
• Invisible moisture can cause blistering, delamination, and flash rusting.
• Critical for almost all types of coatings, especially in humid environments.

Memory trick: Dew point's low, adhesion will grow.

To prevent efflorescence recurrence after removal, it is crucial to identify and eliminate the source of moisture intrusion that brings soluble salts to the surface.

• Efflorescence is moisture-driven.
• Removal is temporary without source control.
• Common sources: leaks, rising damp, faulty drainage.

Memory trick: Efflorescence's return means moisture's deep concern.

Two-part (2K) coatings require precise mixing ratios of base and activator, and once combined, they have a limited 'pot life' (working time) due to chemical reactions.

• Mixing ratio is critical for proper curing and performance.
• Pot life is temperature-dependent; higher temperatures reduce working time.
• Exceeding pot life leads to gelation, poor adhesion, and coating failure.

Memory trick: Mix the parts right, then race the clock before it sets too tight.

Applying too much penetrating sealer, especially without wiping off excess, causes the material to form a weak, non-adherent film on the surface that is prone to premature peeling, flaking, or tackiness.

• Penetrating sealers are absorbed, not film-forming.
• Excess material on the surface creates a weak layer.
• Leads to premature coating failure: peeling, flaking, tackiness.

Memory trick: Don't let the deck wear a coat, or it will shed its skin and float.

The lowest temperature at which a paint or coating can be applied effectively, ensuring proper film formation, drying, and curing.

• Crucial for proper film coalescence in water-based paints.
• Affects solvent evaporation and chemical reactions in solvent-based paints.
• Ignoring can lead to poor adhesion, cracking, and premature failure.

Memory trick: Temperature and humidity dictate paint's quality fate.

The process of cleaning powdery white salt deposits (efflorescence) from masonry surfaces after the moisture source has been mitigated.

• Caused by soluble salts migrating to the surface and crystallizing.
• Requires addressing moisture source first.
• Typically removed with brushing and dilute acid wash.

Memory trick: Stop the water, scrub the salt, then acid it all.

Penetrating stains are designed to soak into wood fibers rather than form a film on the surface. Brush application is often preferred to ensure deep, even penetration.

• Brush application allows working the stain into the grain.
• Ensures better protection and color uniformity.
• Wiping off excess is often necessary for even results.

Memory trick: For deep stain, a brush is your gain.

The application of a primer to new or bare interior wood surfaces to promote adhesion, seal the wood, and create a uniform base for paint.

• Enhances topcoat adhesion and durability.
• Helps seal porous wood.
• Water-based acrylics are common for general use.

Memory trick: Clean wood, water-based, smooth finish, easy prime.

High relative humidity slows the evaporation of water from water-based coatings, extending drying times and potentially causing application defects or poor film formation.

• Water-based paints rely on water evaporation for drying.
• High RH means the air is saturated with water, reducing evaporation rate.
• Slow drying can lead to sagging, blistering, or poor adhesion.

Memory trick: Humid air makes water-based paint cry, so give it a fan to dry.

The process of removing existing rust from metal surfaces and applying a protective coating to prevent future corrosion.

• Mechanical removal (sanding/grinding) is often required.
• Rust-inhibitive primers are essential.
• Ensures longevity of paint system on metal.

Memory trick: To stop rust's spread, sand to bare, then 'prime' ahead.

Shellac-based primers are fast-drying, excellent stain blockers, and can be applied effectively by brush, roller, or spray, with airless spray often preferred for large, uniform coverage.

• Dries very quickly.
• Excellent for blocking water stains, smoke, and odors.
• Requires alcohol or ammonia for cleanup.

Memory trick: For primers, choose your weapon: brush, roll, or spray with precision.

Fisheyes are small, round, crater-like depressions in a wet paint or lacquer film, typically caused by surface contamination (oil, grease, silicone) that repels the coating.

• Caused by low surface tension areas on the substrate.
• Prevented by thorough cleaning and degreasing.
• Can sometimes be remedied with a 'fisheye eliminator' additive, though prevention is best.

Memory trick: Fisheyes spot the oily dot.

The process of protecting window glass and frames from paint during interior or exterior painting.

• Uses painter's tape for clean edges.
• Masking paper or plastic film covers large areas.
• Proper application prevents drips and overspray.

Memory trick: Tape the edge, then cover wide, for a clean paint ride.

Proper surface profiling (e.g., CSP 2-3 via acid etching, grinding, or shot blasting) is critical for mechanical adhesion of epoxy coatings to concrete floors.

• Epoxy requires a mechanical bond.
• CSP standards define surface roughness.
• Acid etching or grinding achieves profiling.

Memory trick: Epoxy's embrace needs concrete's coarse face, not just a clean space.

Type 2 (eddy current) Dry Film Thickness (DFT) gauges require zeroing on the uncoated, unprofiled substrate to establish an accurate baseline for measuring non-conductive coatings on non-ferrous metals.

• Type 2 gauges for non-ferrous metals (aluminum, copper).
• Measures changes in eddy currents in the substrate.
• Zeroing on the bare substrate is critical for accuracy.
• Ferrous substrates (steel) require Type 1 (magnetic) gauges.

Memory trick: Zero your gauge on the bare base, or your numbers will be out of place.

A common painting technique where paint is first distributed onto a surface by rolling in a large 'W' or 'M' shape, then filled in, and finally 'laid off' with light, even strokes in one direction for a smooth finish.

• Ensures even paint distribution and coverage.
• Helps maintain a wet edge to prevent lap marks.
• Laying off minimizes roller texture and streaks.

Memory trick: W's and M's, then smooth it with ease, for a finish that will please.

Preparing an intact fiberglass gel-coat for repainting involves light scuff sanding with fine-grit sandpaper to create a mechanical profile for adhesion, followed by thorough cleaning.

• Gel-coats require mechanical abrasion for adhesion.
• Fine-grit sanding prevents damage.
• Thorough cleaning after sanding is critical.

Memory trick: Dull gel-coat needs fine-grit's touch, not harsh scrapes or just a quick rush.

Alkyd paints cure primarily through oxidation, a chemical reaction with oxygen in the air, which is influenced by temperature and humidity.

• Requires oxygen for curing.
• Lower temperatures slow the oxidation process.
• High humidity can slightly retard, but temperature is a dominant factor.

Memory trick: Alkyd's slow, temperature's low, that's the flow.

Stable hairline cracks in plaster are best repaired with flexible, fine-grained fillers like acrylic latex caulk or spackling compound to ensure a smooth, durable finish.

• Material choice depends on crack size and stability.
• Flexibility is key for minor plaster cracks.
• Avoid rigid fillers for hairline cracks.

Memory trick: Cracks call for Caulk, not Concrete or Complex compounds.

The process of filling small, non-moving cracks in plaster walls or ceilings to achieve a smooth, paintable surface.

• Setting-type compounds are preferred for rigidity.
• Cracks must be clean and free of loose debris.
• Surface must be primed after repair.

Memory trick: Plaster cracks need a 'setting' solution, not a 'flexing' one.

Always adhere to the paint manufacturer's specific thinning instructions, considering the paint type, application method, and environmental conditions.

• Thinning too much can reduce paint durability and coverage.
• Different paint types require specific thinners (e.g., water for latex, mineral spirits for oil-based).
• Manufacturer instructions are paramount for optimal results.

Memory trick: Read the label, then grab your water or paint thinner.

The process of thoroughly cleaning exterior wood surfaces to remove dirt, mildew, and loose contaminants before painting or staining.

• Essential for paint adhesion and longevity.
• Power washing with detergent is a common effective method.
• Requires proper drying time before further steps.

Memory trick: Power wash, Detergent, Dry: The Triple Threat to Exterior Grime.

Moisture-cured urethanes react with atmospheric moisture to cure. Proper relative humidity levels are critical; too little moisture slows curing, while too much can cause rapid surface skinning and defects.

• Requires specific RH range for optimal cure.
• High RH can cause blistering, foaming, or dullness.
• Low RH can lead to very slow or incomplete cure.

Memory trick: Humidity's high, the cure will cry; humidity's low, the cure won't go.

The period during which a multi-component coating system remains suitable for application after its components have been mixed, before it becomes too viscous or begins to cure.

• Influenced significantly by temperature; higher temps shorten pot life.
• Determined by the specific chemical reaction of the components.
• After pot life expires, material should be discarded, even if it appears usable.

Memory trick: Pot life's clock speeds up when heat is high, don't let your paint solidify!

For painting, self-adhesive plastic film designed for hard surfaces offers the most professional and effective protection for hardwood floors due to its secure adhesion and impervious barrier.

• Protection prevents damage and costly repairs.
• Adhesive film prevents slippage and seepage.
• Consider duration of job and traffic levels.

Memory trick: Hardwood's haven needs a sticky shield, not just a fabric field.

Mildew on wood surfaces must be killed and cleaned before painting or staining to prevent its regrowth and ensure proper adhesion of the new coating.

• Bleach solutions kill mildew spores.
• Mechanical removal alone is insufficient.
• Proper drying after cleaning is essential.

Memory trick: Mildew Means Must Be Murdered Before More Moisture Makes Mess

Before painting new or repaired plaster, a pH test is essential to ensure the surface is sufficiently neutral (below 9) to prevent paint failure due to alkalinity.

• High pH (alkalinity) causes saponification.
• Saponification leads to paint degradation.
• Alkali-resistant primers mitigate high pH.

Memory trick: Peeling Plaster's pH must be Perfected for Paint's Proper bond.

To achieve a smooth finish over a flaking, heavily textured wall, first remove loose material by scraping, then apply skim coats of joint compound to level the surface.

• Loose texture must be removed.
• Skim coating fills and smooths.
• Multiple thin coats are better than one thick coat.

Memory trick: Flaking texture's fall means a skim coat's call for a smooth wall.

A defect in clear lacquer films appearing as a milky or hazy cloudiness, caused by moisture condensation on the film due to rapid solvent evaporation and evaporative cooling.

• Common in high humidity or cold conditions.
• Occurs when water gets trapped in the drying film.
• Can sometimes be remedied by applying a 'blush retarder' or very thin coat of lacquer thinner.

Memory trick: Blushing lacquer, hazy and white, too much moisture, not quite right.

Visible lines or areas of darker color where sections of stain overlap, typically occurring when a wet edge is not maintained during application, causing dried stain to be recoated.

• Common with semi-transparent and opaque stains.
• Prevented by working in manageable sections and maintaining a wet edge.
• More noticeable on large, flat surfaces and with fast-drying products.

Memory trick: Lap marks appear when the wet edge disappears.

The process of stabilizing and repairing areas where drywall paper has torn, exposing the gypsum core, before applying finishes.

• Essential to seal exposed paper/gypsum to prevent moisture issues.
• Shellac or oil-based primers are effective sealers.
• Prevents bubbling and uneven absorption of subsequent coats.

Memory trick: Torn paper, seal it first, or your paint will burst.