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The CO2 emission from automobile plants is large. A majority of this quantity comes from the body painting process. A breakdown of CO2 emissions from the painting process shows the significant impact of painting process equipment such as the oven used to cure paint and the air conditioning facilities used to maintain controlled temperature and humidity on CO2 emissions. It was concluded, therefore, that shortening these processes will effectively promote the reduction of CO2 emissions. Removing the primer process means that the basecoat (BC) and clearcoat (CC), which provide color and marketability, would be applied on the E-coat directly. By the removing the primer several issues are raised such as stone chipping resistance, weather durability, color variation and appearance. By contrast, this 3Wet painting system applies two coats of waterborne basecoat, dividing it up into 1-Base and 2-Base and then CC, in order to achieve both targets, quality and color variation.