Tools, Equipment, and Materials Handling
Tools, Equipment, and Materials Handling examines whether you can choose, operate, clean, and store painting equipment safely. The exam expects practical judgment about brushes, rollers, sprayers, sanders, and chemical storage, not a catalogue of brand names.
Brushes and rollers
- Natural bristle suits solvent-borne coatings; synthetic filament suits waterborne coatings because it resists softening.
- Roller nap controls release and finish: short nap for smooth drywall and metal, medium for plaster and wood, long nap for rough masonry.
- Match roller cover fibre to solvent; a waterborne cover in solvent can shed or degrade.
Spray equipment
- Airless tips are identified by orifice size and fan width, such as 517; higher pressure increases flow but also overspray and tip wear. Replace worn tips because a worn orifice delivers more material than the number suggests.
- HVLP uses high volume at low pressure and improves transfer efficiency, but fluid tip and air cap must match the coating.
- Ground equipment, bond containers, and flush with the correct solvent; ignition sources must be controlled.
Materials handling
- Read the SDS before decanting; use secondary containment, proper labelling, and compatible pumps or funnels.
- Respect shelf life, pot life, and storage temperature; waterborne products can be ruined by freezing, and catalyzed products cure in the container once mixed.
- Lift with mechanical aids where possible; keep aisles and egress clear.
Worked example
A job needs 400 m² at a required coverage of 40 m²/L, so theoretical paint is 10 L. If spray transfer efficiency is 60%, delivered paint must be 10 ÷ 0.60 = 16.7 L. At 80% transfer efficiency, only 12.5 L is needed. The 4.2 L difference is the cost of poor gun adjustment, distance, and overspray.
Traps that cost marks
Raising pressure to cure a bad fan pattern usually increases overspray; using the wrong solvent can gel a coating; failing to ground airless equipment creates a static ignition risk; and mixing more epoxy than the pot life allows wastes the batch.
Key points
- Match brush filament and roller nap to coating and substrate.
- Airless tip size and pressure jointly control output and finish.
- Transfer efficiency changes material quantity and cost.
- Ground spray equipment and control ignition sources.
- Observe shelf life, pot life, and freeze protection.