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Practice questions · 310B F

Performs refinishing procedures

2 questions from this exam area, each with the full explanation shown — not just the answer. Free, no account.

18% of the exam

1

The shop has run out of tear-off mixing pads. Which substitute surface is acceptable for mixing body filler and hardener?

  1. A flap cut from a clean, dry corrugated cardboard box
  2. A few sheets of newspaper laid on the bench
  3. A scrap of unfinished plywood
  4. A clean sheet of glass or rigid plasticAnswer

Why that is right

A mixing board must be flat and non-porous (non-fibrous) so it neither absorbs resin or hardener nor sheds fibres or waxes into the mix. Glass, metal and rigid plastic all qualify; coated-paper tear-off pads are simply the most convenient version.

Why the other options are wrong

  • A. Cardboard is porous and waxed: it absorbs resin and hardener, its waxes dissolve into the filler and its fibres contaminate the mix, giving poor bonding.
  • B. Newspaper is absorbent and fibrous; it soaks up the liquid resin and leaves paper fibres in the filler.
  • C. Bare wood is porous and absorbs resin from the mix, changing the cure, and can shed splinters into the filler.

2

After sanding a cured filler repair, a technician finds hard areas, scattered soft gummy spots and a marbled pattern of hardener colour in the filler. What is the most likely cause?

  1. Too little hardener was added to the whole batch
  2. The filler and hardener were not mixed to a uniform colourAnswer
  3. The panel and filler were too cold when the filler was applied
  4. The cream hardener had spoiled in storage

Why that is right

Visible marbling is the signature of incomplete mixing: pockets rich in hardener cure hard while pockets with none stay soft. The result is uneven cure, poor adhesion, lifting and blistering. Folding and scraping until the colour is uniform prevents it.

Why the other options are wrong

  • A. Under-catalyzing makes the entire batch uniformly soft and slow to cure; it does not produce hard areas next to soft ones or a marbled pattern.
  • C. Cold slows the cure of the whole repair evenly and leaves a tacky surface; it does not create isolated hard and soft pockets.
  • D. Spoiled hardener fails to cure the batch overall; a marbled colour pattern points to hardener that is present but unevenly distributed.

Exam-style practice written to the published Red Seal standard. These are not real exam questions — the official Red Seal sample questions are deliberately excluded from everything we publish.

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