The surface of the car body is very bright and colorful. General requirement glossiness is greater than 90, best can reach 95 or so, the effect that is close to lens face almost, such bright surface, any malady can appear clear, especially dust grain, very conspicuous.
Ash granule is the most difficult factor to handle in painting process and also the most difficult factor to control in painting process. For car painting, more than 80% of the defects are due to ash.
In addition to establishing a standard cleanroom workshop, an air shower is needed to maintain and control the cleanliness of the clean room