Red Seal Painter & Decorator flashcards
Red Seal Painter & Decorator · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- WHMIS 2018 pictogram count
- There are nine GHS-aligned hazard pictograms in WHMIS 2018, covering health, physical, and environmental hazards. Supplier labels and Safety Data Sheets must use them.
- Lead paint presumption year
- In Canada, paint in buildings constructed before 1960 is presumed to contain lead. Test with a chemical kit or XRF before sanding or demolition.
- Silica exposure control
- Crystalline silica dust from sanding or blasting causes silicosis. Use wet methods, HEPA extraction, and a respirator with P100 filters; silica sandblasting is largely banned.
- Isocyanate health hazard
- Isocyanate hardeners in 2K polyurethane and epoxy cause occupational asthma. Use supplied air or organic vapour cartridges with particulate prefilters; odour is not a reliable warning.
- Oily rag fire risk
- Linseed and alkyd oil-soaked rags self-heat and can ignite. Store them in a self-closing metal can and dispose of them as hazardous waste.
- Paint quantity formula
- Litres needed equals area in square metres divided by spread rate in square metres per litre, multiplied by the number of coats. Add about ten percent for porous surfaces.
- Dry film thickness formula
- Dry film thickness equals wet film thickness multiplied by the volume solids percentage. Measure wet film immediately after application with a wet-film gauge.
- Concrete cure before coating
- New concrete must cure about 28 days before coating. Test moisture with a calcium chloride or plastic sheet test and use an alkali-resistant primer.
- Wood moisture for painting
- Wood moisture content should be 12 to 15 percent before painting. Check with a pin meter; higher moisture causes blistering and poor adhesion.
- Cross-cut adhesion test
- ASTM D3359 cross-cut test assesses adhesion of films under about 125 micrometres. A pass allows less than five percent coating removal in the crosshatch area.
- Brush bristle selection
- Natural China bristle suits solvent-borne paints and varnishes. Synthetic nylon or polyester suits waterborne coatings because natural bristle softens and swells in water.
- Roller nap length rule
- Use 6 to 8 mm nap for smooth surfaces and enamels, 10 to 13 mm for walls, and 18 to 25 mm for rough masonry. Shorter nap gives a smoother finish.
- Airless tip number meaning
- The three-digit airless tip number gives orifice size and fan width. A 517 tip has a 0.017 inch orifice and a 10 inch fan at 30 cm.
- HVLP transfer efficiency
- HVLP sprayers atomize under 10 psi at the cap and achieve 65 to 85 percent transfer efficiency. Conventional air spray achieves only 25 to 40 percent.
- Flammable cabinet limit
- Flammable liquids cabinets must be labelled and hold no more than the permit limit, often 45 litres per cabinet in Canada. Check local fire code requirements.
- Alkyd versus acrylic binder
- Alkyds give gloss and adhesion on exterior wood but chalk and yellow. Acrylics offer flexibility, UV resistance, and low VOC, making them preferred for exterior siding.
- Zinc-rich primer use
- Zinc-rich primers protect steel by sacrificial action. They are used on structural steel before epoxy or polyurethane topcoats in industrial coating systems.
- Epoxy recoat window
- Epoxies have a maximum recoat time, often 24 to 72 hours. Exceeding it requires sanding because the cured film has no solvent bite for the next coat.
- Metamerism definition
- Metamerism occurs when two colours match under one light source but not another because their spectral curves differ. Approve colour under the specified lighting.
- Drywall finishing levels
- Level 4 suits flat paint; Level 5 adds a skim coat and is required for gloss and critical lighting. Level 3 is not suitable for gloss finishes.
- Cut-in band width
- Brush a 50 to 75 mm band along ceilings and trim before rolling. Roll into the wet cut-in within 10 to 15 minutes to avoid lap marks.
- Alkyd over latex risk
- Applying alkyd over latex can cause wrinkling if the latex is not fully cured. Sand to dull, clean with a degreaser, and use a bonding primer.
- Bathroom coating choice
- Use semi-gloss or satin acrylic with mildewcide in bathrooms and kitchens. Allow 28 days cure before washing; alkyds yellow in low light.
- Back-priming exterior trim
- Prime all six sides of exterior wood trim and siding. Back-priming prevents moisture wicking and paint failure at joints and end grain.
- Dew point rule
- Surface temperature must be at least 3 degrees Celsius above dew point before applying exterior coatings. Otherwise moisture condenses and adhesion fails.
- Pressure-treated wood weathering
- New pressure-treated wood must weather 3 to 6 months before coating. Moisture and treatment chemicals prevent proper penetration and adhesion.
- Exterior caulk selection
- Use paintable acrylic latex caulk for most exterior joints and polyurethane for high-movement joints. Tool the bead and paint within the recoat window.
- Venetian plaster hardening
- Lime-based Venetian plaster hardens by carbonation as it cures. Apply thin layers and burnish with a stainless trowel, then seal with wax or penetrating sealer.
- Vinyl-to-vinyl adhesive
- Vinyl wallcovering over vinyl requires a vinyl-to-vinyl adhesive. Clay-based paste suits heavy or porous papers; clear wheat paste suits most standard papers.
- Wallcovering pattern match types
- Straight match aligns every repeat, drop match offsets by half a repeat, and random match needs no alignment. Match type determines waste allowance.
- Wallcovering roll calculation
- Drops per roll equals roll length divided by wall height plus pattern repeat, rounded down. Total rolls equals total drops divided by drops per roll, rounded up.
- Change order requirement
- Change orders must be written and signed before extra work proceeds. Verbal approvals are not enforceable; include scope, price, and schedule impact.