1989 Volvo 740
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Corrosion will be accelerated in areas of higher relative humidity, especially where temperatures often
stay above the freezing point and where the atmosphere is affected by industrial pollution, or where salt
is used for de-icing the roads. Where parts of the car are covered with road dirt containing road salt,
corrosion will be accelerated at lower relative humidity than if the surface were clean.
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Increased temperature will cause an accelerated rate of corrosion of those parts of the car which are
not well ventilated to permit quick drying.
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Industrial pollution and the presence of salt will also accelerate the deterioration of paint finishes.
The foregoing identifies the need for every car owner to keep his or her car-particularly the underside-as
clean and dry as possible and to repair any minor damage to paintwork and protective coating as soon as
possible.
The need is more important in those areas where road salt is used for de-icing, the relative humidity is
higher, air pollution is present, and temperatures regularly stay above freezing.
Rustproofing, inspection and touching-up
Your Volvo was carefully and thoroughly rustproofed at the factory. The underbody and wheelhousings
were sprayed with a thick, durable rustproofing compound and the beams, internal cavities and end
sections were sprayed with a low viscous, penetrating rustproofing agent.
There are two very effective methods of maintaining this protection:
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Keep your car clean. Clean the underbody, wheelhousings and the edges of the fender using water at
high pressure.
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Inspect and touch-up the rustproofing if necessary.
The invisible (internal) rustproofing
The invisible rustproofing, used for beams, internal cavities and end sections, should be retreated first
after 36 months and, thereafter, every 24 months.
Bear in mind, if good results are to be obtained, these sections must be treated with a fine spray of
Volvo-approved rustproofing compound at a workshop with the correct spraying equipment. Consult
your local Volvo dealer.
pg. 89 Rustproofing
The visible rustproofing
The visible (external) rustproofing must be inspected by an authorized Volvo dealer at least once a year.
If it is necessary to touch-up the rustproofing, this should be done immediately to prevent moisture
penetration. Wash and dry the car thoroughly before touching up. Use spray-on or brush-on rustproofing
compounds.
There are two different types of rustproofing compounds available:
a. thin (transparent) for visible parts.
b. thick, for parts on the underbody and wheel housing which experience most wear.
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