Automotive Refinishing Technician (410N) — Red Seal

Performs common occupational skills

Which compressed-air conditioning device removes liquid moisture from the supply line before it reaches a spray gun?

1. Inline particulate filter element rated for one-micron solids capture
2. Pressure regulator set below the gun's specified inlet pressure rating as routine practice
3. Refrigerant or desiccant air dryer installed downstream of the receiver
4. Lubricator metering oil into the supply air at the wall outlet block

Liquid water condenses from compressed air as it cools downstream of the compressor and receiver. A refrigerant dryer chills the air to drop the dew point and condense water out before it reaches the gun, and a desiccant dryer adsorbs residual moisture for spray-quality air. A particulate filter captures solids but not vapour or condensed liquid. A pressure regulator only sets pressure. A lubricator must never sit in a paint-air line because it injects oil, which causes fish-eye and adhesion failure on the painted panel.

RSOS 2019 | A-2.03 Maintains spray equipment

Performs preparation

Which degreaser is most appropriate for an unprimed polypropylene plastic bumper cover scheduled for refinish?

1. Solvent-based wax-and-grease remover applied with a rough shop towel as routine practice
2. Soapy water alone with no follow-up wipe before priming the panel
3. Strong aromatic solvent left to soak on the panel before wiping dry
4. Anti-static plastic cleaner designed for low-energy plastic substrates

Axalta VS1200 is an anti-static degreaser whose technical data sheet recommends it for static-prone substrates such as polypropylene plastic bumper covers. That direct manufacturer recommendation makes the anti-static plastic cleaner the supported choice for the stated substrate. The other choices substitute a routine wax-and-grease remover, water alone, or a strong aromatic solvent soak; none is the anti-static product specified by this source. The current coating-system technical data sheet remains controlling.

RSOS 2019 | B-5.01 Performs initial preparation

Performs refinishing procedures

A retarder is added to a topcoat in extreme summer conditions. What spray behaviour does it modify?

1. Speeds solvent evaporation so the panel surface flashes off faster between coats as routine practice
2. Increases film build so coverage of the previous coat is reached in fewer passes
3. Replaces the hardener so a 2K product behaves as a single-component spray
4. Slows solvent evaporation so flow improves and dry spray on hot panels is reduced

A retarder slows solvent evaporation so the wet film stays open long enough to flow and level on a hot panel, reducing dry spray and improving the visual outcome in extreme summer conditions. It does not speed evaporation, which would worsen dry spray. It is not a film-build modifier; coverage is governed by reduction and pass count. It is not a hardener substitute, so a 2K product remains a 2K product when retarder is in the mix and the cure path is unchanged from the system data sheet.

RSOS 2019 | C-8.01 Mixes refinishing materials