How to deal with cracking of body paint? What to do about cracks in car paint?

What should I do if the body paint is cracked? When this happens, you should go to a professional repair agency for sheet metal and paint restoration. The body paint will not crack for no reason, and if the body is deformed, it will cause cracks and cracks in the body paint.

When you repair the paint of your car, you must go to a professional organization, and don't go to some roadside shops to repair it cheaply.

The body paint surface of the car is composed of four layers, from the inside to the outside, which are the electrophoretic layer, the middle coat, the color paint layer, and the clear coat layer. The electrophoretic layer is used to prevent rust, and after the entire body is assembled, the entire body will be soaked in the electric pool, so that a layer of electrophoretic layer will be formed on the surface of the entire body. After forming an electrophoretic layer on the surface of the body, the robot sprays the middle coating, which is also mainly used to prevent rust and improve the bonding ability with the next layer of body paint.

The color paint layer mainly plays an aesthetic role, and the various body colors that we can usually see are presented by the color paint layer. The varnish layer is the outermost layer of paint, which acts as a protective layer of paint and also improves the gloss of the body paint. Usually most of the small scratches are left on the varnish layer, and the scratches on the varnish layer can be removed by polishing.

However, it is not recommended to polish frequently, if you polish frequently, it will lead to a decrease in the thickness of the varnish layer, which will affect the gloss of the body paint.

Smoke and pollutants in the atmosphere are the main causes of fading and discoloration of car paint. Fading is different from oxidation, and when fading occurs, the paint will appear unevenly colored. If the paint of the car is less brown, you can wax the car once.

If the paint loss of the car is more serious, then it is necessary to respray the car to improve the overall aesthetics and enhance the protection of the car. Under the irradiation of the sun's ultraviolet rays, the paint film continuously evaporates oil into the air to protect itself. Over time, the oil content of the paint surface will be too dispersed and lost.

The brightness and depth of the paint surface are greatly reduced, so that the paint surface slowly whitens, forming an oxide layer, and shortening the life of the paint.

In such a situation, you can go to the 4S shop for maintenance, because the body paint is cracked and you can't repair it, so you need a professional master to repair it.

Touch-ups can be applied to cracked areas, so that the paint of the car can be repaired without corroding the paint.

You can drive your car directly to the repair shop and let the masters help you recoat your car with a coat of paint.

If it is more obvious, only thoroughly depaint, grind to the metal surface, and then repaint.

1. Method: grinder.

Grind off, re-plaster, spray paint.

2. Symptoms: If you don't usually do some necessary care for the paint surface, metallic paint.

A very fine crack can occur, which will continue to penetrate the paint until it "breaks through" the entire layer of paint, a phenomenon called "cracking", which usually occurs on metallic paint. The crack is difficult to detect with the naked eye at the beginning, but it is more serious when it is visible to the naked eye.

3. Prevention: Frequent waxing can reduce the occurrence of cracks.

The air bubbles in the coating film swell due to climatic reasons or the internal stress in the coating film increases, causing the coating film to fail.

The paint is not mixed evenly, the thinner is insufficient, or the model is not right.

The surface treatment of the substrate is not good, the sandpaper is too coarse, the cleaning is not clean or the gap is not filled properly.

There is oil or water in the compressed air pipes.

The coating film is too thick, and the leveling time between the coating films is not enough.

When painting, the temperature of the substrate is too high or too low.

Thermoset coatings are sprayed on undercured or thermoplastic acrylic films.

Precautions for cracking in automotive paint.

The paint must be mixed evenly, and the thinner should be used according to the specified ratio and model.

Strictly treat the surface of the substrate, paying special attention to the treatment around the feather edge.

Proper maintenance of compressed air equipment.

With the correct spraying method, the coating film of each coating should be thin and wet to ensure the leveling time between the coating films. When spraying, the temperature of the surface of the substrate should be appropriate.

Spray a layer of epoxy paint to seal the thermoplastic acrylic coating.

If the crack is minor and only affects the topcoat, sandpaper can be used to sand the crack until the full surface is exposed, and then re-painted. If a crack penetrates the base paint, the defective area should be completely removed, the substrate defect should be completely repaired, and then re-painted.

Cracks in the paint surface of the new car can be repaired by a 4S shop, and the temperature is high in summer, so do not park outdoors to avoid paint loss after exposure.

1. Before, during and after the use of the vehicle, the dust on the vehicle body should be removed in time to minimize the adsorption of dust by the static electricity of the vehicle body.

2. Rinse in time after rain. After the rain, the rain stains on the car will gradually shrink, so that the concentration of rainwater acidic substances will gradually increase, and if the rain stains are not rinsed with clean water as soon as possible, the topcoat will be damaged over time.

3. When washing the car, it should be carried out after the engine is cooled, and do not wash the vehicle in the scorching sun or high temperature, so as not to leave traces after the detergent is dried. Usually use special detergent and neutral living water to wash the vehicle by yourself, and should not use alkaline laundry detergent, soapy water and washing spirit to prevent washing off the grease in the paint surface and accelerating the aging of the paint surface.

4. Use a clean and soft rag or sponge to prevent metal chips and sand particles from being mixed with the vehicle, and do not use a dry cloth, dry towel or dry sponge to wipe the car so as not to leave scratches. When wiping, you should gently wipe from top to bottom in the direction of the water flow, and should not draw circles and wipe horizontally.

5. For some special traces of strong corrosiveness, they should be removed in time. In this regard, it must be cleaned with a special detergent, and it should not be scraped with a blade or eliminated with gasoline at will, so as not to damage the paint surface. Generally, small abrasions, such as scratches on the surface of the paint, whitening of the scars or even if the surface of the paint is scraped into a hair-like shape, there is no need to touch up the paint.

Light, you can handle it with car wax. Heavy ones, do a polish will do.

How to repair car paint cracks? The repair methods for cracking in automobile paint are: 1. Minor cracks can be polished and waxed; 2. For more serious cracks, the paint film of the entire area needs to be sanded until a complete and smooth surface is exposed, and then the paint is re-painted; 3. The crack of the car paint has exposed the primer, and the local touch-up paint should be done after polishing.

The maintenance methods of automobile paint are: 1. Remove the dust on the car body in time to minimize the adsorption of dust by the static electricity of the car body; 2. Rinse the rain stains with water as soon as possible after the rain to avoid damaging the paint surface; 3. Do not wash the vehicle in the scorching sun or high temperature when washing the car; 4. Use a clean and soft cloth or sponge to scrub the vehicle to prevent metal filings and sand particles from being mixed to leave scratches. @2019

Performance phenomenon of cracking on the surface of automobile paint.

Irregular cracks or cracks in the coating film usually appear in the gaps filled on the substrate or near the edges of the plates. Cracks in the coating film tend to form triangles or stars, and the depth of the cracks in the coating film varies. Severe cracks will reach the substrate directly.

During topical repairs, slight cracks may appear after spraying a coating on the edges of the feathers.

The main cause of car paint cracking.

Due to climatic reasons or increased stress in the coating film, the air bubbles in the coating film swell, making the coating film ineffective.

1) The paint is mixed unevenly, the thinner is insufficient, or the model is wrong.

The surface treatment of the substrate is not good, the sandpaper is too thick, the cleaning is not clean or the gap is not filled properly.

There is oil or water in the pressurized air pipe.

The coating film is too thick, and the leveling time between coatings is not enough.

When painting, the substrate temperature is too high or too low.

Spray a thermoset coating on an undercured or thermoplastic acrylic film.

Precautions for cracking surfaces in automotive paint.

1) The paint must be mixed evenly, and the thinner must be used according to the specified ratio and type.

The surface of the substrate is treated strictly, paying special attention to the treatment around the pinnae edges.

Proper maintenance of compressed air gas equipment.

With the correct spraying method, the coating film should be thin and wet each time to ensure the leveling time between the coating films. When spraying, the temperature of the surface of the substrate should be appropriate.

Spray a layer of epoxy paint to seal the thermoplastic acrylic paint.

Repair method for cracks on the surface of automobile paint.

If the crack is minor and only affects the topcoat, you can sand the crack with sandpaper until the full surface is exposed, and then spray it again. If the crack penetrates into the varnish, the coating film in the defective area should be completely removed, and the defect in the substrate should be completely repaired and then sprayed again.

Minor cracks can be polished and waxed; More severe cracks require the entire area to be sanded until a complete and smooth surface is exposed, and then repainted; After the paint is cracked, the primer has been exposed, and it is also necessary to do partial touch-up paint after sanding; The cracks in the paint are generally very subtle in the early stage, and then they will continue to penetrate the paint until the color paint layer, which is already more serious when it can be detected by the naked eye.

Minor cracks can be polished and waxed; More severe cracks require the entire area to be sanded until a complete and smooth surface is exposed, and then repainted; If the paint is cracked and the primer has been exposed, it is also necessary to do partial touch-up paint after polishing; Paint cracks are generally very subtle in the early stages, and then they will continue to penetrate the paint until the color paint layer, which is already serious when it can be detected by the naked eye.

Causes and repairs of paint cracks: 1. Paint oxidation: The perennial exposure of sunlight is the main reason for shortening the life of the paint.

Ultraviolet rays from sunlight can eventually cause oxidation of car coatings. If the body is still hanging with water droplets when exposed to the sun, the oxidation rate will be much faster. If it is slightly oxidized, it can be removed with wax, and once the oxidation is severe, it must be ground and polished.

2. Crack in car paint: Crack in car paint is easy to appear on metal paint, which is a very fine crack that will continue to penetrate the paint until it "penetrates" the entire color paint layer. When waxing and polishing, you will notice that there are streaks on the body, which is due to the presence of car wax in the cracks.

Due to the quality of the paint, the resin in the paint will also crack due to "shrinkage". This "disease" can only be achieved by repainting. Frequent waxing is a good way to reduce the occurrence of cracks, and when the cracks are still in the "budding" stage, wax can throw away cracks that are invisible to the naked eye.

3. Paint fading: fading and discoloration generally occur in the front cover, roof and rear compartment cover of the body. When fading, the car cherry envy paint appears uneven color difference ridge sun shooting.

To prevent the fading of the car paint, it is of course essential to wax frequently, and in addition, frequent car washing can also reduce the fading, and the slight fading can be treated by waxing and polishing. Moderate fading can be treated with grinding, and in severe cases, it must be repainted.