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1985 Volvo 740 GL, GLE, Turbo
2. 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.
3. Increased temperature will cause an accelerated rate of corrosion of those parts of the car which are
not well ventilated to permit quick drying.
4. 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:
● Keep your car clean.
Clean the underbody, wheelhousings and the edges of the fender using water at high pressure.
● Inspect and touch-up the rustproofing if necessary.
The invisible (internal) rustproofing
The invisible rustproofing (used for beams, internal cavities and end sections) must be retreated after not
more than 3 years and, thereafter, every second year.
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. 79 Rustproofing
The visible rustproofing
You should check the visible (external) rustproofing at regular intervals (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.
An oil can with a long flexible spout may be used for parts which are difficult to reach.
There are three different types of rustproofing compounds available:
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