12.13.3 Diagnostic Information and Procedures
12.13.3.1 Common Paint Defects and Treatment
Note
Adding black box in the table indicates the treatment.
Defects
Causes
Treatment
Powder
1. Film subject to strong erosions, such as
the strong ultraviolet radiation.
2. Incorrect ratio in the paint mixture.
3. Coating low resistance to sun and bad
weather.
4. Vehicle is not cleaned regularly or
thoroughly.
5. Incorrect choice of car cleaning agents
or polishing wax too coarse.
1. Polishing
2. Conventional grinding and polishing
3. Deep grinding and finesse polishing
4. Local paint repair
Plastic Paint Peeling
1. Poor adhesion between the coating and
the substrate or outer coating too hard
2. Coating too thick or erosion caused by
water vapor, acid and alkali in the air
3. Under coating treated incorrectly;
pinholes and defects in the outer paint
layer
1. Polishing
2. Conventional grinding and polishing
3. Deep grinding and finesse polishing
4. Local paint repair
Cracking
1. Primer inadequately stirred
2. Spray paint too thick
3. Middle coating too thick
1. Polishing
2. Conventional grinding and polishing
3. Deep grinding and finesse polishing
4. Local paint repair
Bird Droppings
Erosion
1. Bird droppings erosion
1. Polishing (mild erosion)
2. Conventional grinding and polishing (medium erosion)
3. Deep grinding and finesse polishing
4. Local paint repair (severe erosion)
Scratch
1. Film with low hardness
2. Hard objects scratch
1. Polishing (minor scratches)
2. Conventional grinding and polishing (thick scarring)
3. Deep grinding and finesse polishing
4. Local paint repair (scratched)
Body, Sheet Metal and Painting
Paint/Coatings
12-161
EC718/EC718RV EC715/EC715RV 10/2009
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