Body Finishing - Saab SONETT III Service Manual

BODY FINISHING
General
The Sonett III is painted with a two-component polyure-
thane lacquer. The lacquer is delivered with a separate
hardener and the two components are mixed immediately
before use and diluted to a sprayable viscosity with thin-
ner. The ready-mixed paint can then be used for about
four hours. The paint hardens in two or three hours at
room temperature; after 16 hours it is bone dry and can
be polished. It takes about a week, however, for the paint
to attain its ultimate optimum film properties.
The hardening process can be accelerated by the use of
elevated temperatures; the paintwork can be pol ished
after drying for one hour at 80°C (176°F) and cool ing
to room temperature.
Where more than one coat is applied, not more than 24
hours should elapse between applications. Af ter any lon-
ger interval the surface should be ground to improve ad-
hesion between the coats.
Painting new body parts (two coats)
NOTE
With Sadolin & Holmbald series 107 laquer, use
hardener No. 871-0138 and Aerogloss thinner
No. 804-0103.
With Nordsjö 56197— lacquer, use hardener VV-13
and thinner DT 96.
Preparation
Wash the bodywork with thinner.
Lacquer
Before using, mix the lacquer and hardener in the pro-
portions: 2 parts Lacquer to 1 part Hardener and dilute
with Thinner, taking care to measure the proportions of
lacquer and hardener accurately. Do not mix more than
you are likely to use with in about four hours. The body-
work must be perfectly dry before you start painting.
Spraying
Spray three times wet on wet at a viscosity of 18-19 sed
Frikmar 4/20°C (atomiser pressure about 2 bar, 28.5 psi).
Drying
Air for 10 minutes, then oven-dry for 50 minutes at 80°C
(176°F).
Grinding
When the bodywork has cooled off, f ill any holes with
polyester filler and then go over the whole surface with
No. 400 grinding paper. After grinding, allow the surface
to dry thoroughly before apply ing the next coat of paint.
Spraying
Spray twice wet on wet at a viscosity of 16-17 sec/Frikmar
4/20°C (atomiser pressure 2 bar, 28.5 psi).
Drying
Air for 10 minutes, then oven-dry for 1 hour at 80°C
(176°F).
Equipment cleaning
Clean the spray gun and other painting equipment imme-
diately after use with Sado Thinner No. 803-0208.
Aerogloss Thinner is not suitable for equipment cleaning.
Fin ishing
If there are any defects in the paintwork finish after the last
coat has been applied (if the paint has run or picked up
dust), it may be possible to correct these defects as follows:
1. Allow the bodywork to dry thoroughly (see under
Dry ing above).
2. Allow to cool thoroughly (about 1 hour), then wet-
grind the defective areas lightly with No. 600 paper.
3. Machine-polish the ground areas of the paintwork
with fine grinding paste followed by Slipol No. 840—
0025 until all abrasion marks have been removed.
4. Finally mach ine-polish the whole surface (right out to
the edge) with Slipoline No. 840-0040.
Nov. 1972
SAAB
890-1