The construction process of painting varies depending on the type of car, with different characteristics and emphasis. The primary coating component for heavy-duty cars is the front cab, which has the highest coating requirements; The painting requirements for other components such as carriages and frames are lower than those for the driver's cab. There is a significant difference between the painting of passenger cars and that of passenger cars. The bus body includes the main beam, framework, interior of the carriage, and exterior of the body, with higher requirements for the exterior of the body. The exterior of the car body not only requires good protection and decoration, but also has a large spraying area and multiple planes, with two or more colors, and sometimes there are sedan color bands. Therefore, the construction period is longer than that of a truck, the construction requirements are higher, and the construction process is more complex than that of a truck. Cars and small station wagons have higher requirements for exterior decoration and bottom protection than large passenger cars and cargo cars. Its exterior coating belongs to the first level of decoration accuracy, with a beautiful appearance that is as bright as a mirror or smooth, without fine impurities, scratches, cracks, wrinkles, bubbles, and visible defects, and should have sufficient mechanical strength. The bottom coating belongs to an excellent protective layer, which should have excellent rust prevention and corrosion resistance, and strong adhesion; Part or all of the putty with good adhesion and high mechanical strength will not rust or peel off after several years of use.

What are the methods for removing the old paint layer on the exterior of a car?

(1) The commonly used methods for removing the old paint layer on the surface of steel include flame treatment, technical or mechanical methods, and chemical methods.

(2) The flame treatment method uses the high temperature of a flame (such as a blowtorch) to remove oil stains, old paint edges, and oxide scales.

(3) Craft or mechanical methods involve using tools such as scrapers, shovels, wire brushes, sandcloth, etc. to remove, as well as pneumatic or electric tools.

(4) Chemical methods for paint removal, useful alkaline solution for paint removal, and paint removal agents (models T-1, T-2, T-3) for paint removal. Alkali stripping is the process of brushing and applying the alkaline solution to the surface of the old paint layer, allowing it to dry slightly before applying it, up to 3-4 times. After the old paint layer expands and softens, use a shovel to clean it, and then use hot water to clean the surface of the object until the remaining alkaline solution on the surface of the object is removed.

Article source: Qingyuan Automotive Repair Paint http://www.jinliangxincai.com/