Sunday, June 28, 2020

Interpretation of lacquer surface maintenance in detail to avoid wrong use of beauty methods

Heavy snow brings difficulties to travel

Compared to rain, the snow on the car body is more damaging to the paint. Because snow is not as clean as it looks, in addition to containing a lot of dirt, snow also contains many substances that are harmful to car paint (such as acidic substances or corrosive salts), and because the snow melts and evaporates slowly, if not Clean up in time, the snow will stay on the body for a long time, and the paint surface will inevitably be eroded. However, the snow on the car body is not as easy to clean as the rain, because the snow will freeze on the car body after melting. When cleaning with a rag or snow shovel, it is easy to cause scratches on the car paint. Therefore, it is best to wash the car immediately after the snow, but if there is continuous snowfall, the newly washed vehicle will be immediately covered by snow, and frequent car washing will also damage the paint, which really makes the owner dilemma.

Fortunately, winter is short-lived. After suffering a lot from the car, the new year is finally ushered in. However, the rainy weather in spring in many areas will become a headache for car owners. At this time, it may be that the maintenance company recommends waxing and sealing to car owners. The best time for glaze and coating these kinds of lacquer beauty care projects.

However, at present, many people inside and outside the industry have questioned these types of paint surface maintenance projects. There are different opinions on whether these maintenance projects can really protect the paint surface. Some people even believe that these beauty care projects are doing more harm than good for car paint. Articles about the maintenance of damaged paint on lacquer surfaces are also common in media such as newspapers, magazines and websites.

The authors believe that there are two main reasons for this phenomenon: One is due to the unevenness of the product and construction quality. Many car owners often spend money but have not received results, so they believe that these maintenance projects are harmful to the vehicle, resulting in some New car owners are also worried about paint surface maintenance; another is that some car owners mistakenly believe that paint surface maintenance projects should be done often, and the effect is obvious, resulting in damage to vehicle paint due to too frequent paint surface beauty maintenance construction (such as waxing) . The most fundamental reason is that many people lack the knowledge of paint surface maintenance. To this end, this article will introduce some knowledge of lacquer surface maintenance, and analyze how to reasonably choose lacquer surface beauty maintenance items and supplies to avoid the negative impact of lacquer surface beauty maintenance methods on the lacquer surface.

1. The main cause of damage to the paint surface of the car body

First of all, let's understand the main causes of paint damage to the car body. Generally, the paint surface of vehicles used for more than 1 year may produce various paint surface defects such as oxide film, traffic film, cracks, discoloration, etch marks, water marks and scratches.

1. Paint oxidation

Perennial sunlight is one of the main reasons for shortening the life of the car paint. The ultraviolet rays in the sun will eventually cause the automobile coating to oxidize. Under the ultraviolet rays of the sun, the paint film continuously evaporates oil into the air to protect itself. It will cause the oil content of the paint surface to be excessively dispersed, resulting in a significant reduction in the brightness and color depth of the paint surface. The paint surface slowly forms an oxide layer, the service life of the car paint is shortened, and the car paint is black, white, and dull. If the car body with water stains is exposed to sunlight, it will aggravate the oxidation of the paint. This is because the water droplets will become a natural "convex lens", focusing the sun to cause the paint to burn.

2. Traffic film

When the vehicle is driving, friction will generate strong static electricity. Static electricity has a strong adsorption capacity for dust, oil and chemical dust, and a layer of hard traffic film will slowly form on the body surface, which will cause the paint surface to easily undergo oxidative corrosion.

3. Crack

Cracking usually occurs on metallic paint. Improper maintenance or aging of metallic paint may produce a very fine crack. The crack will continue to deepen until it "breaks through" the entire paint layer. This phenomenon is called cracking. The initial cracking is difficult to detect with naked eyes, so when the cracking phenomenon can be observed with naked eyes, it indicates that the damage to the paint surface has been serious. When repainting metallic paint, if there is a problem with the construction quality of the paint, the resin in the car paint may crack due to "shrinkage".

4. Water marks

The water marks are ring-shaped, which are the traces left after the water droplets evaporate. Almost all vehicles have water marks in varying degrees. The chemicals in the water marks will continue to chemically react with the car paint when the car body is exposed to sunlight and heat up, causing damage to the car paint. Paint surface is oxidized, cracked and the surface of the car body cleaned by common cleaning agents is more prone to water marks.

5. Etching

Bird dung, insect carcasses, leaves, tar pitch and other substances staying on the body surface for too long will slowly react with the car paint and begin to erode the car paint. Their erosion rate is much faster than the water mark. The resulting damage to the paint surface is called etch.

6. Fading

Pollutants in the atmosphere are the main cause of the discoloration and discoloration of car paint. Discoloration and discoloration generally occur on the engine compartment cover, roof and luggage compartment cover.

Discoloration is different from oxidation. When oxidation occurs, the surface of the car body becomes black and white; while when discoloration occurs, the car paint has uneven color difference. The discoloration mechanism of metallic paint and color paint is different. The discoloration of metallic paint is caused by the corrosion of aluminum powder in metallic paint caused by contaminated dust and acids and alkalis in rainwater; the discoloration of paint is due to the discoloration of paint The pigment reacts with certain substances to cause a change in color, and sometimes etch marks appear.

6. Scratches

Car paint scratches are mainly caused by improper daily maintenance. For example, when wiping the car, there are hard particulate substances in the dust on the body surface, which causes fine scratches on the paint surface during wiping.

Second, frequent paint surface beauty maintenance is easy to cause damage to car paint

Why is the beauty care of the paint surface done to protect the car paint sometimes damage the paint surface? This is because, in addition to the new car, in order to remove the various paint defects mentioned above, before doing the glaze and coating, Usually the paint surface needs to be polished first, even if it is used for car paint waxing, if the paint surface defects are obvious, in order to achieve the best effect, the polishing process will be adopted first. Paint surface polishing can grind off the defective paint film to restore the gloss of the paint surface, but at the same time it will also make the car paint thin to a certain extent. Moreover, the operation requirements of the polishing construction process are very high. If the builder is not professional enough, the paint layer may be directly worn through, causing irreparable damage to the paint surface, and only repainting.

Therefore, you should pay attention to the following 2 points when car paint beauty maintenance: First, you should not do paint beauty maintenance too frequently, and should be carried out according to the ideal cycle of each process; second, you should choose a formal professional car beauty shop or maintenance The enterprise carries out construction. For enterprises, it is imperative to improve professionalism and ensure construction quality.

1. Paint polishing supplies

Polishing needs abrasives, polishing agents, watering cans, polishing machines and polishing discs and other supplies and equipment.

Polishing supplies

(1) Abrasive and polishing agent

The abrasive contains fine particles, which can remove deep oxide layers and slight scratches and pitting and vertical flow that occur during painting. Polishing agents can be divided into reduced polishing agents and rapid polishing agents. Among them, the reduced polishing agent is also called a moderate polishing agent. Its particles are finer than those of the abrasive, which can remove light scratches in the paint surface. The oil contained in it penetrates into the paint when the paint surface is polished to supplement The oil lost by the paint plays a repairing role; the fast polishing agent is also called fineness polishing agent. Its particles are finer than those of the reducing polishing agent. It has the dual effect of removing the oxide layer and waxing. As the last process of polishing, it can be used by hand To complete, repair the halo and other phenomena caused by uneven polishing of the machine, which has a brightening effect.

(2) Watering can

During the polishing operation, the watering can is used to spray water to the polishing part, which plays the role of cooling, cleaning and lubrication.

(3) Polishing machine and polishing disc

The polishing machine is divided into two types, electric and pneumatic. Compared with the pneumatic polishing machine, the electric polishing machine (Figure 5) has a higher speed and adjustable speed, a larger power, and a better grinding and polishing effect. The polishing machine smoothes and polishes the lacquer surface by rotating the grinding disc or the polishing disk to remove minor lacquer defects and improve the brightness. At present, there are three main types of polishing discs used in polishing machines: wool discs, coarse sponge discs and soft sponge discs. Among them, the wool disc and the coarse sponge disc are used for moderate polishing and grinding, while the polishing surface of the soft sponge disc is mostly made into an uneven wave, which is conducive to fine polishing, and the polished lacquer surface is as clean as a mirror. Need to distinguish use. When using a polishing machine for polishing operations, the following points should be noted.

Electric polishing machine

① Never touch the work surface when the polishing machine is turned on or off.

②When polishing, the turntable and the working surface should be kept basically parallel.

③ Do not put down the machine until the polishing machine completely stops running.

④ Do not work too close to the frame, bumper and other parts that may bite the outer edge of the turntable.

⑤ Pay attention to the wire of the polishing machine at all times to prevent the wire from being caught in the machine.

⑥ When polishing, be careful not to let the dust splash everywhere, but let it fall to the ground.

2. The main points of the polished construction

When polishing, first adjust the speed of the polishing machine, after fully moistening the sponge disc with water, throw away excess water. Then apply a small amount of moderate polishing agent to the paint surface (each small piece of paint surface is treated once, not a large range of paint), and start polishing from the roof. The sponge disc of the polishing machine keeps tangent to the paint surface, the intensity is moderate and the speed is kept constant, the polishing needs to be performed in a certain order. After the operation using the medium polishing agent is completed, replace with the fine polishing agent and repeat the operation once according to the above steps.

3. Reasonable use of lacquer beauty maintenance methods can prevent or eliminate lacquer damage

1. Car paint waxing

Waxing is one of the most commonly used paint surface maintenance projects. Waxing the car body can effectively protect the paint surface and make the paint surface shine. Its main functions include the following points.

① Polishing effect. Polishing is one of the most basic functions of car wax. After waxing, vehicles can restore the finish of their paint surfaces to varying degrees.

②Waterproof effect. Car wax can reduce the adhesion rate of water droplets on the paint surface of the car body by 60% to 90%, minimize the burning of the paint surface caused by the focusing effect of strong sunlight, and effectively prevent the formation of water marks.

③ Grinding and polishing. When there are shallow scratches on the paint surface of the car body, you can use abrasive polishing wax to polish the paint surface. If the scratches are not serious, the polishing and waxing operations can be completed at one time.

④High temperature resistance. Car wax can effectively reflect the incident light from different directions, thereby reducing the rise speed of the body temperature, and preventing sunlight from penetrating through the transparent paint, causing the aging and discoloration of the base paint and extending the service life of the paint surface.

⑤ Anti-static effect. There are two main ways to generate static electricity in a car: one is caused by friction between chemical fibers, fabrics (such as carpets), seats, and clothing; the other is due to the friction between the dust in the air and the paint surface of the body during the driving process of the car . The static electricity generated by the second way is the cause of the paint traffic film. The anti-static effect of car wax is mainly by blocking the direct contact of air and dust with the paint surface of the car body, thereby effectively preventing the generation of static electricity on the car watch, and greatly reducing the adhesion of charged dust to the car watch.

⑥Car wax also has the functions of preventing rain, snow erosion and salt fog

Advantages: Compared with sealing glaze and coating, waxing has the lowest cost and has a certain protective effect on car paint in a short period of time; simple operation, divided into two construction methods: manual waxing and machine waxing, among which manual waxing owners can DIY.

Disadvantages: The effective period is the shortest among the three, only about 1 to 2 weeks, so frequent waxing is required. Generally, car wax has a certain grinding effect. Even if it is manually waxed, it will inevitably damage the car paint.

2. Sealing and coating

Both the coating and the sealing glaze are coated with a chemical substance on the surface of the car paint. A high hardness, anti-oxidation and corrosion-resistant film formed on the surface of the car paint protects the car paint. The main difference between the two is There are differences in construction technology and materials. In addition to new car paint, before the glaze and coating construction, the paint surface must be ground or polished to achieve the best results. The advantages and disadvantages of the sealing glaze and coating are introduced as follows.

(1) Sealing glaze

The basic principle of glazing is to rely on the shock polishing technology to repeatedly press the glaze into the texture of the car paint and combine it with the car paint to form a special mesh protective film. Its advantage is that it can improve the hardness of the paint surface, high temperature resistance and ultraviolet resistance; the disadvantage is that it is easy to cause damage to the paint surface during construction, and because its glaze has easy oxidation, it is easy to co-oxidize the paint surface around it.

(2) Coating

The coating adopts a gentle smearing and wiping construction method. Relying on the molecular binding force of the film itself to adhere to the paint surface can avoid damage to the paint and effectively protect the paint; due to the use of anti-oxidation materials and stable synthesis In this way, the negative impact on the paint surface is avoided, and the validity period is longer than that of waxing and sealing. However, the coating construction time is longer and the cost is higher, and the brightness of the painted surface after coating is not as good as waxing and sealing.

In view of the respective advantages and disadvantages of the three paint surface maintenance processes of waxing, sealing glaze and coating, beauty and maintenance companies can recommend the most suitable items for car owners from different places. The author believes that because the effective period of waxing is very short, and frequent waxing has a certain damage to the car paint, it is more suitable for the old car that requires less protection of the paint surface, but only occasionally needs to "bright" the old car; sealing glaze It can improve the hardness of the paint surface, and it is more affordable than the coating film, and is more suitable for low-end models of economic type; the coating film is suitable for the middle and high-end models with higher paint quality.

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