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Which cavity treatment supplements the paint system?

  • A.Underseal applied to the exterior of the floor pan, which is the only area exposed to the road spray beneath
  • B.Chrome plating
  • C.A sacrificial anode attached to the body, which corrodes preferentially and therefore protects the steel structure
  • D.Wax injection into box sections and sills

Answer: D

Cavities collect moisture and are impossible to inspect, so a wax that creeps into seams and displaces water is injected through access holes during manufacture. Underseal protects the exposed underside and is a complementary rather than an alternative measure. Sacrificial anodes are used on ships and buried pipelines rather than on vehicles.

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