Saab 2000 9-5 - Manual (Page 211)

211 Car care and technical information
Stir both primer and touch-up enamel thor-
oughly before use and allow each coat to
dry before applying the next.
Two-coat enamel
As the name implies, two-coat enamel is
applied in two operations. The first coat, the
base color, contains the pigment, metal
flakes and binder. The second coat consists
of a clear enamel, which provides the final
gloss for the paintwork and protects the
base from moisture and environmental con-
taminants.
Touch-up stone-chip damage as follows:
1 Thoroughly clean the damaged area.
2 Apply the primer, base color and finally,
the enamel. To achieve the best finish,
apply two or three coats of primer.
Anticorrosion treatment
The entire car is corrosion-protected at the
factory in different stages by an electrolytic
immersion coating and a polyester-based
protective coating to protect against corro-
sion caused by stones flung up by the
wheels. A thin penetrating anti-rust oil is
also applied in cavities and body members.
In addition to conventional anti-corrosion
treatment like painting, underbody treat-
ment and cavity treatment, most of the body
panel surfaces are galvanized. These
include the hood, the doors and the under-
body.
The anti-corrosion treatment on the under-
side of the car and inside the wheel arches
is particularly exposed to constant wear and
possible damage, the degree of which will
obviously depend on driving conditions.
What causes rust?
Steel body panels of automobiles are sub-
ject to rusting whenever air and moisture
manage to penetrate the protective finish,
and body panels may rust through if the pro-
cess is unchecked. Rusting can occur wher-
ever water is trapped or where the car’s
panels are continuously damp. Damage to
paint and undercoating by stones, gravel
and minor accidents immediately exposes
metal to air and moisture. Road salts used
for de-icing will collect on the bottom of the
car and promote rusting. Areas of the coun-
try with high humidity have great potential
for rust problems, especially where salt is
used on roads or there is moist sea air.
Industrial pollution (fallout) may also
damage paint and promote rusting.