Interpretation: Where is the original paint?

Many people change cars after the transfer of their old car found that the buyer, especially the more professional second-hand car intermediary pay special attention to the car is not the original paint, and even with the paint film tester for the whole car test. If it weren't for the original paint, there would be a bigger discount on the price.
some experienced "old drivers" will also tell you: the car's original paint try not to move, some small paint damage do not have to pay too much
to
.
's why? Come and tell everyone today: Where is the original paint? Why don't you repaint it easily?The characteristics of the original paint
the original paint is very thin, the general total thickness will not exceed 100 microns, is basically a hair wire diameter, good adhesion, high hardness, strong scratch resistance, but also has good weather resistance, corrosion resistance, so as to form a protective film on the surface of the car body, extending the life of the car.
, no matter what color of the paint, its pigment will fade in the sun. Therefore, the paint will be added to a variety of light stabilizers, antioxidants and so on, the quality of these additives determine the performance of the paint.
the original paint surface generally has the following layers:1. Phosphate film layer: form a dense passivation layer on the surface of the metal substrate, so that the metal substrate is protected from external erosion;
2. Electrophoresis layer: attached directly to the metal body, very important to the car, has the function of preventing metal rust;
3. Medium coating: used to protect the color of the body, with a certain hardness, protect the paint layer from small scratches, while preventing discoloration;
4. paint layer: determines the color of the car;
5. varnish layer: increase brightness, protect the paint layer.General paint coating process
automotive manufacturing plant to the car painting process is as follows:in the welding workshop generated by the white body surface has a variety of oil, welding slag, dust, etc. , the pre-treatment process is to treat these stains, while the white body phosphate treatment, in order to make the body surface to form a layer of increased paint film adhesion and corrosion resistance, moisture-resistant protective layer, so that the body to achieve electrical requirements.
pre-treatment is completed by electrophoresis for primer coating, in the body hanger and electrophoresis paint pool plus different polar charge, the body fully into the primer pool, primer evenly applied to the body and body structure parts of the inner cavity, seams and other hidden interior.in order to improve the sealing and rust resistance of the body, the joint surfaces that make up the body siding need to be coated with sealing materials, and the car floor also needs to be treated with paint. The PVC series of materials is now used in both car sealing and under-car coatings, so this line is also known as the PVC coating line.
is followed by the medium coating coating, which is one of the most important processes in the automotive coating process, and the medium coating acts as a connection: the lower layer is the electrophoresis primer and the upper layer is the body paint. Medium coating will improve the adhesion of the coating and the durability of the coating film.Then spray paint layer, that is, the car's outerst color paint and varnish, car paint is divided into ordinary paint, metallic paint, pearl paint, color paint to the car brought colorful clothes, showing the car's personalization, while protecting the medium coating and electrophoresis primer.
varnish layer has anti-pollution, acid rain, UV protection and other functions, can better protect the paint. After painting, the paint is dried and cooled into the final quality inspection process, polishing, so that the paint coating has a soft, stable luster.The impact of automotive sheet metal paint
car phosphate, electrophoresis only car manufacturers can do, in the car repair process painting process is only to repair the coating, paint layer and varnish layer.
If sheet metal is needed, the galvanizing layer on the surface of the metal material will be destroyed, if the process of heating is used in the sheet metal process, it will also reduce the performance of the metal substrate, especially the main structure of the car uses heat-treated high-strength steel, such as A-pillar, B-pillar, front beam, etc., if heated, the strength of the material will drop sharply, the safety of the body will be reduced, if a collision occurs, it will greatly threaten the safety of the occupants of the vehicle.
sheet metal will also destroy the phosphate layer and electrophoretic layer, these two layers to prevent corrosion of metal has a very important role, after the destruction of ordinary repair process can not be repaired, many car after sheet metal paint easy rust is the reason. In addition, after the metal has been repaired by sheet metal, the surface is uneven, the surface needs to be filled with putty, and putty and metal expansion coefficient is different, a long time will occur cracking, depression and other phenomena, affecting the beauty of the surface. In the car factory coating process, the car paint finally to go through 200 degrees Celsius or so of the car high temperature drying, such paint is very hard, high strength, most of the repair shop baked out of the paint hardness and strength are not as good as the original paint. post-patch paint color ratio is not accurate, there is no comparable to the original spraying process, the environment and the original factory also has a big gap, no matter how sophisticated the late paint technology, a long time will appear color difference, the finished paint will be faster than the original paint aging.
In addition, experienced used car buyers and intermediaries will pay special attention to sheet metal paint in the vehicle's small space after the residual polish dust, splashing flying paint, as well as poor handling of the paint combination of the barge marks, and so on, and as a "bargain" reason.
, unnecessary paint repair will have an impact on the preservation rate of the vehicle, usually, the same condition of the vehicle, the price of the car with a slight scratch and no paint is lower. do I not need to paint?
first of all, minor bruises, and there is no need to repaint the paint surface if it is scratched but the primer is not exposed. Grinding with car wax or waxing a few more times, the scratches will slowly disappear. If the paint will polish off more of the original paint, not worth the loss.
if the scratches are deep, the metal is exposed, but a small damage, then you can use paint pen to repair. Apply the paint evenly to the damage, and when the paint is dry, wipe it again with the wax and you'll be able to get rid of it. if the scratches are deep, the range is large, and even deformed, it has to be painted. Otherwise the metal will come into contact with the air quickly oxidation corrosion, it will be due to small loss. no matter how the paint surface of the car is repaired later, can not achieve the quality and effect of the original paint, which is determined by the production process, production conditions and paint accessories quality, patched again perfect paint, in front of the paint film tester will be "original."
car after sheet metal spray paint, paint and surface material performance will be certain to decline, which is why people do not want to buy repainted used cars.
warm prompt you:
some small slugs can handle on their own, there is no need to make a big move dry go to paint, not to repaint must choose the regular brand repair shop, the use of quality assurance car brand paint.