Car paint is generally baking paint, which needs to be welded in the original car factory (sometimes repaired by hand).

Painting. Usually the first thing (high-end cars first adopt phosphating anti-corrosion technology) is the primer. Immerse the exposed car shell in a syrup-like paint tank and take out the dry primer; Then send it to the dust-free workshop and spray the top coat with electrostatic spraying process. And then dried at a temperature of about 200 degrees. Finally, a layer of varnish is applied, and the whole car painting process is completed.

How to avoid the problems easily caused by painting construction in automobile painting skills? The peeling of paint may be due to the surface being too smooth. If the original paint is shiny or powdery (with untreated paste paint), the new paint will not stick to the surface firmly. It is also possible that the wood is rotten or the metal is rusted, and it is also possible that the poor quality of the paint causes peeling. Small areas of paint peeling off can be polished with fine sandpaper first, then plastered with putty, painted with primer and repainted. All paint must be scraped off and repainted for large-scale peeling. Draw a bubble first, then pop it. If water comes out, it means that water has penetrated under or behind the paint layer. When the paint is exposed to the sun, the water evaporates into steam, and the paint skin will be jacked up into bubbles. At this point, first use a hot air spray gun to remove the foaming paint, let the wood dry naturally, then brush the primer, and finally repaint the whole repair surface. If there is no water in the bubble, it may be that the wood grain is cracked and there is a small amount of air inside. After the sun shines, the air expands and the paint skin bulges. Faced with this situation, first scrape off the blistered paint skin, then fill the gap with resin filler and repaint it, or directly apply microporous paint without filler. In most cases, before repainting, chemical paint remover or hot air spray gun will be used to remove cracks. If the fracture range is not large, you can use a sand grinding block or dry and wet sandpaper to grind off the broken paint. After the surface is polished and smooth, apply putty, brush primer and repaint. Paint flows. If the paint is applied too thick at one time, it will run. Brush the paint before it dries. If the paint has started to dry, wait until it dries. Smooth the paint surface with fine sandpaper, clean the surface, wipe it with a wet cloth, and then reapply the outer paint. Be careful not to brush it too thick. There are many reasons for stains on paint. For example, the water in latex paint dissolves the substances on the wall surface, causing the paint surface to rust, and the wall surface brushed with steel wool will produce rust spots, and the concealed pipes in the wall will leak water and appear color spots. In order to prevent stains, you can brush a layer of primer containing aluminum powder first. If there are stains, you can first remove the latex paint from the site, brush the primer containing aluminum powder, and then brush it again. Wet paint surfaces often become moldy and discolored. For example, when water vapor condenses on the surface of glass or metal, brown-black stains often appear. At this time, the moldy part can be treated with bactericide according to the instructions. After the mold is killed, the surface is cleaned and then repainted. The reason for the loss of luster is that the primer is not applied, or the varnish is directly applied before the primer and internal paint are dry, and as a result, the varnish is absorbed by the wood and loses its luster. The poor quality of varnish is also a reason. Use dry and wet sandpaper to grind off the old paint, brush off the dust after grinding, wipe the surface with a clean wet cloth, and brush the top coat again after drying. It is particularly important to note that the paint film may lose its luster when painted in a very low temperature environment. Wrinkling of paint film is usually caused by brushing for a second time before the paint is wet. At this point, the solvent in the lower paint will affect the upper paint film and make it wrinkle. In this case, the wrinkled paint film can be removed by chemical mercury remover or heating method and repainted. Remember, you must wait for the first paint to dry before painting the second time. Rough paint surface The rough paint surface of the new brush is usually because the paint brush used is unclean or polluted by the surrounding environment. It is also possible that the paint is mixed with patent leather and has not been precipitated and filtered before use, or the paint is wet and dusty. In order to prevent the above problems, clean paint brushes and paint buckets must be used. Before using the old paint, be sure to filter it with paint filter paper or clean nylon. In addition, when the paint is wet, cover the paint surface with a cover or cardboard to prevent dust. If the paint surface is rough, after it is completely dried, polish it with dry and wet sandpaper, and then repaint it after wiping. In particular, the paint brush must be clean. Black spots appear on the surface of painted wood, which may be caused by the fact that the joints were not sealed before painting, and the joints were heated after exposure, and the resin leaked from the joints. At this time, you can scrape off the paint with a scraper, then polish it with fine sandpaper until the knots are exposed, seal the knots with sealing paint, and coat it again after it is completely dried. Paint will dry slowly if the indoor ventilation is not good or the temperature is too low. You can open all the doors and windows to promote ventilation, or put a heater indoors to raise the room temperature. If the problem is still not solved, it may be that the paint is greasy. This can be done by chemical paint remover or heating method to remove paint, thoroughly wipe the surface, and then repaint it. Stick bugs on the paint, try to get rid of bugs before the paint is dry, and then gently repair the surface with a brush dipped in a little oil. If the paint has started to dry, wait until the paint film is completely hardened, and then wipe off the bugs to avoid making a mess of the surface.

Automobile painters who are engaged in spray painting will do little harm to their bodies as long as they take strict labor protection measures (masks, gloves, protective clothing, protective glasses and other supplies) to prevent paint mist from entering the body. Paint does affect the quantity and activity of * * *, and girls are more likely to have children. I wish you a happy job!

Which is better, PPG car paint or swan car paint? Good reason:

Founded in 1883 and headquartered in Pittsburgh, USA, PPG Industrial Company is a global manufacturing enterprise, which produces and manages coatings, glass, glass fiber and chemicals, occupying a leading position in the world. The main customers of PPG automotive coatings include Volkswagen, GM, Mercedes-Benz, Dongfeng Citroen, Peugeot and Chery. Almost all automobile manufacturers in the world use PPG automobile painting products or technologies.

What are the common problems in paint construction? There are many common problems in coating construction. The following are some construction problems of coatings and their solutions:

One: the paint film falls off, peels off, bulges and peels off.

Problem phenomenon: Due to the poor adhesion and adhesion between paint films, there will be pathological phenomena such as peeling, bulging and falling off of paint films, which are common in plastic and metal surface coating.

Solution: Spraying adhesion promoter containing treating agent between plastic and metal substrate and paint coating can improve the adhesion between substrate and paint and solve the problem of paint stripping.

Two: Pinholes

Problem phenomenon: a kind of concave pinhole phenomenon on the surface of paint film. This needle-like pinhole is like a needle-punched pinhole, and its aperture is about 100 micron. (as shown on the right)

The cause of the problem:

1. The surface treatment of the plate is not good, and there are many wood hairs and wood thorns, which are difficult to fill;

2. If the bottom layer is not completely dry, the second construction will be carried out.

3. The prepared paint has not been placed for a period of time, and the paint has high viscosity and bubbles have not been eliminated.

4. One-time construction is too thick.

5. The curing agent and diluent are mismatched;

6. Too much curing agent was added.

7. High ambient temperature and humidity;

8. Wood has high moisture content.

Solution:

1. The blank of the plate should be polished and leveled, and then sealed with Dedebao;

2. When the construction is repeated, the repainting time should be fully separated, and the second construction should be carried out after the lower layer is fully dried;

3. The prepared paint should be left standing for a period of time, and construction should be carried out after bubbles are completely eliminated;

4. The viscosity of the paint should be appropriate, not too thick;

5. One construction should not be too thick, and it should be "carefully brushed for many times". In general, the thickness of single layer should not exceed 20μm m. ..

6. Use the specified curing agent and thinner, and carry out the construction according to the specified proportion.

7. Do not construct when the temperature and humidity are high.

8. Before construction, the wood should be dried to a certain moisture content, generally 10- 12%.

Three: foaming

Problem phenomenon: after the paint film is dried, there are protruding circular bubbles of different sizes, also called foaming. Blister occurs between the coating surface and the paint film, or between two paint films.

The cause of the problem:

1. The substrate treatment is not satisfactory, such as the high moisture content of wood, or the aromatic oil contained in rosin and wood itself has not been removed, resulting in foaming when it volatilizes naturally.

2. When the putty is not completely dried or the primer is not dried, apply oily or water-based putty.

Blister

1. Wood cracks and holes are not filled, but there are cracks and holes.

2. The paint viscosity is too high.

3. The paint proportion is not appropriate.

4. When brushing, drag the brush back and forth, and the bubbles generated are not eliminated.

5. Oil stains, dust, blisters, etc. Attached to the surface of the substrate, and there is moisture around these impurities.

6. There is water in the compressor and air pipe, or water splashes on the construction surface.

7. Most of the reasons are the same as pinholes.

Solution:

1. Wood should be dried to a suitable water content, and aromatic oil or rosin in wood should be removed.

2. After the putty and primer coat are completely dried, the top coat shall be painted.

3. Gaps and holes in wood joints should be filled with putty, polished and leveled before painting.

4. It is best to clean the sundries on the surface of the substrate with a clean rag, and don't touch them with your hands. After cleaning, the coated surface can be coated.

5. The construction viscosity of the coating should be appropriate.

6. Don't drag back and forth when painting. Cut horizontally first, then vertically, and finally straighten along the grain direction.

7. Drain the water from the compressor regularly and install an oil-water separator.

Four: whiteness

Problem phenomenon: The coating contains water or other liquid, the color of the coating is lighter than the original, and the coating is white and foggy.

The cause of the problem:

1. The moisture content of the board is too high, and the water volatilizes and accumulates in the paint film for a long time, resulting in whitening;

2. The ambient humidity is too high;

3. Mix the construction surface, container and coating with water;

4. Diluent volatilizes too fast;

5. The moisture in the bottom paint film is not completely removed;

6. Black walnut and other dark plates are painted with poor transparency, because the transparency problem turns white;

7. The paint construction is too thick;

8. The curing agent is incompatible with the paint and turns white;

Solution:

1. The plate should be dried before construction, and the moisture content of the plate should be controlled below 12%;

2. For dark plates, paint with good transparency should be used for construction;

3. Don't paint once and for all;

4. Don't construct when the humidity is high. If necessary, you can add appropriate slow dry water.

5. The construction surface should be clean and free of moisture;

6. Don't mix water into paint and containers;

7. Use the specified diluent and curing agent;

8. The bottom coating water should be dry, especially when using a water mill.

Five: Bite your ass

Problem phenomenon: the lower layer refers to the phenomenon that the solvent in the upper coating softens and expands the bottom paint film, resulting in poor adhesion of the bottom paint film, leading to peeling and nudity.

The cause of the problem:

1. If the primer is not completely dried, apply the topcoat, and the solvent in the topcoat will easily dissolve and soften the primer, resulting in undercut.

2. When painting the top coat, the operation is not rapid, and the phenomenon of biting the bottom will occur if the brush times are too high.

3. Oily paint films and some synthetic resin paint films modified by drying oil will be eroded once they encounter strong solvents before highly oxidative polymerization. If the primer is phenolic paint and the topcoat is nitro paint, the solvent in the nitro paint will bite off the oily phenolic paint and separate it from the original attached primer.

4. The curing agent dosage of the previous coating is not enough, and the crosslinking is not sufficient;

5. The front and back coats don't match.

Solution:

1. After the bottom coating is completely dried, brush the top coating.

2. When brushing solvent-based coatings, be skilled and operate accurately and quickly to prevent repeated brushing.

3. The base coat and the top coat should be used together.

4. For serious undercut, the coating should be completely removed, and the similar coating should be selected after the base is dried.

Six: particles

Problem phenomenon: dust, flying flocs and foreign bodies are attached to the coating surface.

The cause of the problem:

1. Dust, sand and other sundries are mixed into the paint.

2. When paint is mixed, the bubbles generated will be constructed without dispersion in the paint solution, especially in cold weather, which makes the surface of the paint film rough after drying.

3. The construction environment is not clean, there is dust and sand falling in the paint, or the painting tools such as oil brushes are stuck with sundries.

4. The grass-roots treatment is not satisfactory, the grinding is uneven, and the dust and sand grains are not cleaned up.

5. Improper use of diluent, poor solubility, can not completely dissolve the coating, resulting in particles.

6. Improper use of curing agent is incompatible with paint, resulting in particles.

Solution:

1. Before painting, the prepared paint must be filtered with filter cloth to remove impurities.

2. After the paint oil is mixed, let it stand for 10-20 minutes, and then use it after the bubbles disperse.

3. Windy weather or dusty places are not suitable for construction, and the newly painted paint should prevent dust pollution.

4. The unevenness at the grass-roots level shall be filled with putty, polished with sandpaper, brushed with dust and painted.

5. Use matching diluent and curing agent.

6. The surface of the coating film is rough, so it can be smoothed with sandpaper, and then painted with topcoat. Advanced decoration can be smoothed with sandpaper or sand wax, and finally waxed, polished and polished.

Seven: Don't do it or do it slowly.

Problem phenomenon: After a period of time, the coating is still not dry and hardened.

The cause of the problem:

1. The coating surface contains moisture;

2. The curing agent is added too little or forgotten;

3. Use diluent containing water and higher alcohol;

4. The temperature is too low and the humidity is too high, which does not meet the drying conditions;

5. The bottom layer is too thick, or the interval between layers is too short.

Solution:

1. Water is completely dry before spraying;

2. Adding curing agent in proportion to mix paint;

3. Use the matching thinner provided by the manufacturer;

4. Spraying at normal temperature;

5. Two or more times of construction, to extend the interlayer construction time. If the coating cannot be dried, it should be scraped off or washed off with a cloth dipped in acetone.

Eight: drooping

Problem phenomenon: paint flows on the coated surface or at the groove of line angle. The thickness of the paint film is uneven, and the paint curtain sags in severe cases and tears in beads in light cases.

The cause of the problem:

1. Too much thinner makes the viscosity lower than the normal construction requirements, and the paint cannot fall and flow on the surface of the object.

2. The temperature in the construction site is too low, the drying speed of the coating is too slow, and the fluidity in the film formation is large.

Step 3: Choose pigments.

? Nine: orange peel

Problem phenomenon: the surface of the coating film is not smooth, showing an orange peel-like concave-convex state.

The cause of the problem:

1. Too thick paint and too little thinner;

2. The spraying pressure is too large or the distance is too close, and the spraying amount is less and the distance is far;

3. The site temperature is too high, drying too fast, and the paint cannot be completely leveled;

4. The wind speed in the working environment is too large;

5. Using low boiling point diluent, when the paint mist reaches the surface of the coating, the solvent will evaporate;

6. After the curing agent is added, it will be left for a long time before construction.

Solution:

1. Pay attention to the paint mixture ratio and mix the paint reasonably;

2. Fully proficient in the use of spray guns;

3. Improve the conditions of the construction site;

4. Prevent painting in strong wind;

5. Paint mixing with suitable thinner;

6. Use it up as soon as possible after adding paint mixing curing agent.

7. Adding proper amount of zinc oxide can eliminate this phenomenon.

? X: Cracking

Problem phenomenon: There are cracks with different shades on the surface of paint film. If the lower surface can be seen from the crack, it is called "cracking"; If there are tiny cracks on the paint film like turtle's back, it is called "cracking".

The cause of the problem:

1. Primer and topcoat are not compatible, and the paint film is affected by external factors (mechanical action, temperature change, etc.). ) produces shrinkage stress, leading to cracking or rupture of the film.

2. Brush (spray, brush or roll) the top coat before the primer is completely dried, or if the first coat is too thick, brush it for the second time before it is completely dried, so that the internal and external expansion of the coating is inconsistent.

3. Indoor paint is used outdoors or metal surface primer is used for wood.

4. The wood substrate contains turpentine, and if it is not removed for a long time, the paint film will seep out and cause local cracking.

5. If the moisture content of wood is too high, it will deform and crack after a long time;

6. Adding too much curing agent or using the wrong curing agent;

7. Too thick construction;

8. The construction environment is harsh, the temperature difference is large, the humidity is high, and the paint film expands with heat and contracts with cold due to cold and heat, resulting in cracks.

Solution:

1. Primer and topcoat should be matched, as should primer and substrate.

2. Dry the bottom layer before applying the next layer. The first coating should be thin and thin, and then the second coating should be applied after drying.

3. Choose suitable coating varieties, especially outdoor coatings, and choose coatings with good weather resistance.

4. To remove turpentine from wood substrate, wash it with wine first, and then seal it with sealing primer.

5. Construction according to the specified proportion;

6. Don't paint it very thick, and the total thickness should not exceed150μ m. ..

7. The construction shall be carried out under suitable environmental conditions, and the paint shall be fully stirred before painting.

8. The moisture content of wood should be controlled below 65438 02%.

How to control the color difference of topcoat in the process of maintenance will bring convenience to maintenance, but in practice, the color of touch-up paint is difficult to completely match the color of old paint, even if the topcoat with exactly the same composition is sprayed, there will still be color difference. In order to reduce the color difference between old and new paints, the majority of automobile maintenance painters have accumulated rich experience through years of practice, and minimized the color difference of local touch-up painting. The specific operation method is as follows.

1. Fade out method. When the color of the repair paint does not match the color of the old paint film, the color of the local repair paint can be gradually filtered to be close to the color of the old paint film during the construction operation. That is, when spraying the last coat, adding a proper amount of similar varnish to the original diluted paint can alleviate the color difference between the treated old and new paints.

2. Use double-layer adhesive tape for local integral spraying. Using the changing parts of the car body and car model, such as angle, double-sided tape technology is used to cover before spraying. First, cover the paper with the first tape along the crease and stick it above the corner edge, then stick the second tape on the first tape. After local correction, the visual difference caused by the brightness of two adjacent sides of the corner can be used to slow down the chromaticity difference between the old and new paints. This method is better for silver background paint. It should be noted that when spraying two layers of adhesive tape, it should be as thin as possible, tear off the adhesive tape after drying, and then polish the paint film.

To avoid hard edges.

3. Use the boundary wrinkles of the car door or body parts as the boundary for local spraying. Before spraying, the damaged parts should be polished and coated with two layers of primer. The old paint film of the parts to be sprayed should be polished with 280#~400# water sandpaper, scrubbed with solvent, and then sprayed locally. After local whole spraying, it can be transferred by using the boundary folds between components.

Which is better, PPG car paint or Futian car paint? PPG Industrial Company was founded in 1883, the world's largest paint manufacturer, headquartered in Pittsburgh, USA, and a Fortune 500 company. PPG oil is imported paint. Futian paint is a well-known trademark in China, a famous trademark in Guangdong and one of the top ten paint brands in China. Futian paint is a domestic paint.

To sum up: PPG car paint is better than Futian car paint.

Which is better, PPG car paint or Laishun car paint? Is it imported paint? Laishun is an imported brand of Akzo Nobel, and PPG is also an imported brand. There is definitely no problem for paint performance. Paint is a semi-finished product, and it is a finished product when it is really applied to your car. So the jargon is "three-point paint and seven-point construction", and even the best paint is not good! So workmanship is more important than the material itself.

Before painting the car, look at the brand of the car according to the VIN code, then find out the color according to the color card, find out the formula through the computer and make fine adjustments.

Car paint? On rainy days, roads will be congested, private cars will increase, and small bumps between vehicles have become commonplace. In the past, we had to send the car to the 4S shop because we were worried about the maintenance quality of the roadside maintenance point, but the expensive pricing and waiting time of at least 2-3 days in the 4S shop were really frustrating. A BMW owner said that not long ago, it rained continuously and his eyesight was not good. Driving a new car, he was brushed by a taxi coming from behind and lost a large piece of paint. At that time, I went to the 4S shop and the garage, and it was too late. It took a long time to disassemble the sheet metal work. I painted and baked it all day. It can't be repaired for two days, and the price is still high. It's not safe to go to a roadside shop to repair it. Just when Mr. Chen was at his wit's end, a friend introduced him to a nationwide chain of "Little Thumb" car repairs, which dealt with small bumps and delivered cars on the same day with good quality and quantity. So he listened to his friend's advice and went to the "little finger" for repair, which took about four hours. Afterwards, Mr. Zhang was satisfied with the paint quality, maintenance scope and service attitude, and the cost was about one-third cheaper than that of 4S shop. According to the manager of Zhuyeshan Store in Wuhan, Little Finger is the largest professional automobile maintenance chain brand in China. It uses international advanced technologies such as computer paint mixing, infrared baking, professional painting, bumper repair, automobile glass repair and surface rapid plastic surgery to create a brand-new and professional concept of "automobile minor repair", which can be painted in rainy days.