The abrasive effect of sand and stones at high speed quickly destroys the top layer of paint, leaving characteristic chips and matte spots on the body. That is why understanding the structure of paint coating (LCP) is necessary for every vehicle owner who wants to prevent the appearance of rust and preserve the presentation of the machine. LKKP It is a complex multilayer system where each level performs a strictly defined function, from anti-corrosion protection of metal to creating a deep glossy shine.
Modern painting technologies allow you to create coatings that are resistant to ultraviolet light and chemical reagents, but even they require proper care and timely recovery. The destruction of any of the layers, whether it is a microcrack in the lacquer or swelling of the soil, opens up direct access of moisture to the body metal. As a result, irreversible oxidation processes begin, which can eventually lead to through corrosion and expensive body repairs.
In this article, we will examine in detail the anatomy of automotive paint, consider common defects and methods of their elimination, and discuss current methods of protection. You will learn why a simple wash is not always safe and how to properly assess the condition of the coating before buying a polish or protective film. Proper exploitation It starts with understanding what your carβs βclothingβ is made of.
The structure of paint coating: the anatomy of protection
Car paint is not just a colored layer applied to metal, but a high-tech βcakeβ consisting of several interconnected components. The foundation of the whole system. phosphate, which is created in the factory and provides adhesion (adhesion) of the paint with metal, as well as primary anticorrosion protection. Without this microscopic layer, the paint would quickly detach itself at the first mechanical impact or temperature drop.
A layer is applied directly to the phosphate. primerIt flattens the surface and hides small defects in the metal. Next is the base layer containing the pigment, which sets the color of the car. Completes the design of a transparent varnish that protects color from burnout and gives depth. Violating the integrity of any of these levels requires immediate intervention.
β οΈ Warning: Attempting to paint the rust without removing the damaged metal and restoring all layers will only lead to a temporary cosmetic effect, after which corrosion will manifest itself again with a vengeance.
The thickness of each layer is strictly regulated by the manufacturer and is usually measured in microns. Factory LCP has a total thickness of 80 to 150 microns, and exceeding these values in artisanal repairs can lead to problems with drying and durability of the coating. Understanding this structure helps car owners avoid mistakes when caring for themselves and choosing a childcare service.
Main types of damage and their causes
Operating the car in real conditions inevitably leads to defects on the surface of the body. The most common enemy of the LCP is wear-and-wearThis is caused by small particles of sand and dust that act as sandpaper when moving. Over time, this leads to clouding of the varnish and the appearance of the so-called "web" - a grid of micro scratches visible in the sun.
Chemicals used by utilities in winter also pose a serious threat. Acid rain, bird droppings and tree sap can penetrate the microscopic pores in the varnish and cause a chemical reaction that destroys the pigment. If you do not remove aggressive substances in time, indelible spots or even bloating may appear on the surface.
- π Scotch: They are formed from the impacts of gravel and stones, violate the integrity of all layers up to the metal.
- π«οΈ Oxidation: loss of shine and fading of color due to prolonged exposure to ultraviolet light.
- π§ Corrosion: rusty points that occur in places of violation of the tightness of the coating.
- π¨ Razznotone: Uneven paint burnout or errors in local repairs.
Particular attention should be paid to mechanical damage, such as deep scratches. If the nail does not cling to the scratch, then only the upper layer of the varnish is damaged, and the defect can be removed by polishing. In the case when the nail "fails", the damage has affected the base layer or the ground, which requires more serious restoration with painting.
Diagnosis of the state of the body: thickness gauge and visual inspection
Before buying a used car or planning restoration work, it is necessary to conduct a high-quality diagnosis. The main tool for assessing the thickness of the LCP is thicknesser A device that measures the distance from the sensor to the metal. Normal values for factory paint vary between 90-140 microns, but it is important to consider that the thickness may vary slightly in different parts.
The device allows you to identify hidden defects, such as putty under a layer of paint, which is often used in poor-quality repairs after an accident. Values above 200-300 microns usually indicate the presence of a putty, and readings close to zero or showing the presence of only plastic may indicate the replacement of the part or the use of a very thick layer of filler.
| Indicator (ΞΌm) | Condition of coverage | Probable cause |
|---|---|---|
| 90 β 140 | Factory LKP | Normal condition, factory painting |
| 150 β 200 | Secondary coloring | Cosmetic repair, polishing with thinning |
| 200 β 400 | Putty | Recovery of geometry after impact or deep scratch |
| > 500 | Thick layer | Rough body repair, self-taught bodybuilder |
Visual inspection also plays an important role. It is better to inspect the car in bright but diffuse daylight. Under direct sunlight or bright light spotlights in the sink, small defects may not be noticeable. Pay attention to the boundaries of color transition between the details (for example, the door and the wing) β the presence of a variety of colors indicates a repainting.
βοΈ Checklist of LCP check before purchase
Technology of restoration and polishing of LCP
Restoring the appearance of the car most often begins with professional polishing. This process involves removing the microscopic layer of lacquer to eliminate scratches and oxidation. There are several types of polishing: restorative, protective and abrasiveEach of which is applied depending on the condition of the coating.
Abrasive polishing is used to remove deep defects and requires the use of a polishing machine and pastes with varying degrees of grain. The process begins with a coarse paste to remove the main damaged layer, then follows the work of fine abrasive paste to create gloss. The final stage is the application of protective compounds that seal the pores and give hydrophobic properties.
β οΈ Attention: Excessive fascination with abrasive polishing thins the lacquer layer. After 3-5 deep polishing, the varnish may not remain, and repainting of the part will be required.
For local damage, such as single chips, the method of point restoration is used. The master carefully fills the chip with a special paint in the color of the body, then levels the surface and polishes the transitions. This allows you to stop corrosion and make the defect almost invisible without the need to paint the entire part.
Modern methods of protection: ceramics, film and liquid glass
The auto cosmetics market offers many solutions for extending the life of the LCP, and the choice depends on the budget and operating conditions of the car. Ceramic coating (ceramics) creates a solid mineral layer on the surface, which is characterized by high chemical resistance and hydrophobicity. Ceramics does not protect against chips, but perfectly protects from chemistry and facilitates washing.
Polyurethane films (anti-igravity protection) are a physical barrier with a thickness of 150 to 200 microns. The film takes on the impacts of stones and scratches of branches, keeping the native paint intact. This is the most effective, but also the most expensive way of protection, which is often applied to high-risk areas: hood, bumper, headlights and mirrors.
- π‘οΈ Anti-gravel film: Maximum protection against mechanical damage.
- π Ceramics: Protection from chemistry, dirt and ultraviolet, lotus effect.
- 𧴠Liquid glass: Budget option for short-term shine and hydrophobe.
- π―οΈ Wax compositions: Traditional protection that requires frequent updates.
It is important to understand that no coating is eternal. Films turn yellow or cloudy over time (although modern materials last up to 10 years), ceramics are washed out, and wax is washed off after a few washes. Regular maintenance and proper washing are the key to the durability of any protection.
Rules of care and washing for the preservation of the LCP
Proper car care can significantly extend the life of paintwork. The main enemy in washing is dirt on the surface of the body. If you start rubbing dry or under-moistened dirt, it will work like an abrasive, leaving hundreds of micro scratches. Therefore, pre-processing is required. foamingIt softens and washes away the main layer of pollution.
Using household chemicals for washing a car is not recommended. Means for washing dishes or floors have an aggressive alkaline composition, which washes away not only dirt, but also protective wax layers, and can damage the structure of the varnish. Specialized car shampoos have a neutral pH and contain additives to facilitate the slip of the sponge.
Drying the car also requires attention. Left in the sun, water droplets work like lenses, focusing the sunβs rays and burning microholes in the varnish, and also leaving lime plaque after drying. You need to use either special lilaless towels made of microfiber, or purging with compressed air.
β οΈ Attention: Automatic brush washers are guaranteed to leave a "web" of scratches on the body. To maintain the ideal condition of the LCP, it is recommended to use only contactless washing with subsequent manual drying or the services of deli-ling centers.
FAQ: Frequently Asked Questions
How often should the car be polished?
The frequency of polishing depends on the operating conditions and condition of the LCP. Recovery polishing is not recommended to do more than once every 1-2 years, so as not to thin the varnish. Supportive polishing with protective compounds can be carried out every 3-6 months.
Can I make the rust myself?
Temporarily stop corrosion can be with the help of a rust converter, but fully paint over the damaged area so that it does not differ and lasts for a long time, without skills and equipment is difficult. For deep corrosion, it is better to contact professionals.
What is the difference between liquid glass and ceramics?
Liquid glass is a softer silica-based compound that lasts 6-12 months. Ceramics are a harder, more durable coating with a high content of SiO2 that can last 2 to 5 years and better protect against chemistry.
Why are there still divorces after the wash?
Divorces can remain due to the use of hard water, dirty towels, insufficient shampoo rinsing, or the presence of bitumen and metal inclusions on the body that a conventional wash does not remove.
Do I need to wash my car in winter?
Yes, washing your car in winter is necessary to flush out reagents and salt that accelerate corrosion. However, this should be done in a warm box and be sure to thoroughly dry the hidden cavities and locks so that they do not freeze.