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164n
Caring for your vehicle
Exterior finish
To provide effective corrosion protec-
tion, multilayer paintwork is applied
at the factory. Cataphoretic immersion
priming techniques are supplemented
using special body-cavity protectants,
with the application of specially-devel-
oped and extensively tested materials.
A layer of flexible PVC is first applied to
the undercarriage. Following this, a
comprehensive undercoating treat-
ment with a wax-based protectant is
applied.
Regular maintenance makes an impor-
tant contribution to maintaining the
safety and value of your vehicle.
Increasing awareness of the effects of
harmful environmental factors on
vehicle finishes have led paint and
vehicle manufacturers to initiate
ongoing programs designed to further
improve the durability of their finishes.
Despite this, environmental factors that
occur locally or regionally can have
negative effects on the finish of your
vehicle. These should guide you in
determining the frequency and extent of
your efforts to maintain the vehicle
finish.
Depending upon material and type
of impact (perforation of paint layer),
physical stresses from sand, road salt,
gravel, etc., can cause corrosion to
start extending beneath the finish,
starting at the point of impact.
Road dirt, tar spots, dead insects,
animal droppings (strong alkali effect)
and tree excretions (resins and pollen)
all contain substances capable of
causing damage when allowed to
remain on the finish of your vehicle for
any period of time (spots, etching,
flaking, separation in the top coat).
In industrial areas, deposits from fly
ash, lime, oil deposits, sulfur-dioxide in
precipitation (acid rain) and other envi-
ronmental pollutants will all damage the
surface of the vehicle unless adequate
protection is provided.
In coastal regions, high levels of atmo-
spheric salt and humidity promote
corrosion.
In tropical zones, temperatures of over
+105 7 (+40 6) in the shade prevail,
in addition to heavy ultraviolet radiation
and high humidity. Under those condi-
tions, light paints can reach tempera-
tures up to +175 7 (+80 6) and dark
paints up to +250 7 (+120 6).
Online Edition for Part No. 01 41 0 155 558 - © 09/00 BMW Group
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