C70 Coupe L5-2.3L Turbo VIN 53 B5234T3 (2001)
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Sand down to primer coat (P 320) and rebuild topcoat.
Code 90 - Craters in paint ("fish eyes")
Cause
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Silicon in environment or paint
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Oil or water in spray air
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Thinning too fast
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Incorrect thinning
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Wrong oven temperature.
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Paint viscosity too thick.
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Evaporation time before firing too short. Should be 10-15 minutes.
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Excessive application at high temperatures.
Action
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Sand down to the panel and repaint surface.
If craters are only in topcoat, there is no need to sand down to the panel.
Code 91 - Flaking paint, edge peeling or stone chips
Cause
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Poor cleaning
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Poor bonding
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Wrong paint used
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Other mechanical causes, e.g. stone chips
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Mechanical causes after the vehicle is passed by factory quality control, e.g. in transit.
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Paint coat too thick, e.g. after touching up.
Action
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Sand down and rebuild a new coat of paint.
Check adhesion of topcoat by applying tape to paint surface and pulling away suddenly.
If topcoat sticks to tape, sand down to primer coat (P 230), rebuild topcoat.
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Apply paint with touch-up brush or repair spraying.
Code 92 - Atmospheric effects on paint (Oil, bird droppings etc.)
(Industrial emissions/ acid spots)
Cause
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Aggressive chemical substances such as limestone, cement, rust and acid vapor in conjunction with moisture, mainly affect horizontal surfaces,
e.g. bird droppings, oil, soot, degreasing agents etc.
(Bird droppings)
Cause
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Droppings, especially from seabirds, corrode painted surfaces.
Action
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Minor changes in color can be remedied by sanding with P 1200 sandpaper and polishing. For extensive areas of staining, sand down and rebuild
paint work. Spray primer coat on areas which are sanded through.
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Clean immediately when discovered, if serious, respraying is required.
Code 93 - Mechanical impact on paint (spark shower)
(Industrial emissions, flying rust, spark shower from train etc.)
Cause
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Rusty iron dust particles on paint (horizontal surfaces). Spark showers from railway, street car, trolley-bus contact leads and train brakes etc.
Action
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Clean with 3% oxalic acid and then wash down with plenty of water. Polishing may be necessary for heavy damage. If particles are embedded
deep in paint, paint repairs will be necessary.
