The professional name for the material used to cover the car body is automotive enamel, and not just “paint”, which is due to the complex chemical composition and method of polymerization of the coating. Unlike household paint compositions, automotive enamels contain special resins, pigments and solvents that provide high adhesion to metal, ultraviolet resistance and mechanical strength. Understanding the exact nomenclature is essential to selecting the correct repair composition, as using the wrong type of enamel will result in peeling or discoloration within a short period of time.
Modern industry offers various painting systems, each of which has its own marking and application technology. Base enamel (Base Coat) requires mandatory varnishing, whereas acrylic enamels (Single Stage) already contain a glossy component and dry on their own. A mistake in determining the type of your factory coating can be costly, so be sure to check the technical documentation or color code before purchasing materials from an auto shop.
It is important to note that the common everyday name hides complex chemistry, which includes not only color pigment, but also binders. It is critical to distinguish between one-part and two-part formulations, since the latter require the addition of a hardener and cannot be used without it. Next, we will analyze the main types of coatings, their characteristics and identification methods.
Main types of automotive enamels
The first thing the owner or craftsman needs to decide on is the chemical basis of the material. The most common option in modern body repair are metallized enamels, which contain aluminum particles to create a shimmering effect. Such compositions almost always belong to the “base coat + varnish” system and do not have their own gloss after drying.
Another popular class is acrylic enamels, often called "acrylic". They are a ready-made product that, when mixed with a hardener and applied, produces a glossy surface without the need for varnishing. However, it is worth remembering that even acrylic can be different: there are soft and hard versions that differ in drying speed and final strength.
- 🎨 Metallic (Base Coat): Requires the application of acrylic varnish for protection and shine.
- 💧 Acrylic (Single Stage): Self-coating, dries with a gloss, often used for budget repairs.
- 🚗 Mother of pearl: Contains mica instead of aluminum, changes color depending on viewing angle.
- 🛡️ Matrix/Candelur: Specialized enamels with the effect of “liquid metal” or deep mirror.
The choice between these types is dictated not only by the desire of the owner, but also by the factory painting technology of a particular model. For example, most modern foreign cars leave the factory in the “base-varnish” system. An attempt to cover such a surface with ordinary acrylic without a base will result in the color spreading unevenly and the “apple-apple” effect (the effect of changing shade) becoming pronounced.
Difference between paint, base and varnish
There is often confusion in terminology when users ask what the paint for a car is called, meaning the entire “pie” of coating at once. In fact, in the professional environment the concepts are clearly divided base coat (color layer) and varnish (protective transparent layer). Base enamel is responsible solely for color and visual effects, but it is porous and not resistant to aggressive chemicals.
Varnish, or clear coat, is applied over the base and performs the function of protection. It is he who takes on the blows of small stones, exposure to ultraviolet radiation and chemical washes. Without varnish, the base paint will quickly fade, lose saturation and can be washed off with a solvent. In metallic systems, visual volume is created precisely due to the passage of light through the varnish layer, reflection from base particles and return back.
⚠️ Attention: Never attempt to polish Base Coat without varnish. You will simply erase the color layer down to the primer or metal, since the base does not have a hard surface film.
There are also one-step systems where paint and varnish are combined in one product. Such materials are called single-component enamels (although they often require a hardener, becoming two-component at the time of preparation). They are easier to apply for beginners, but are inferior to two-stage systems in depth of color and durability. For spot repairs of chips on dark cars, a two-stage system is often used to better match the tone.
Why does the varnish turn yellow?
Over time, the clear varnish may take on a yellowish tint. This occurs due to the oxidation of components under the influence of ultraviolet radiation and high temperatures. Cheap varnishes turn yellow faster. High-quality two-component varnishes with UV filters retain transparency for decades.
Color coding systems (Catalog numbers)
To accurately select the material, it is not enough to know the name of the color, for example, “White Ice” or “Black Onyx”. Manufacturers use a complex system of codes that allows you to recreate the shade with an accuracy of a fraction of a percent. These codes are usually called Paint Code or simply "paint code". They are a combination of letters and numbers unique to each shade in the manufacturer's catalog.
The code is searched using special correspondence tables (cross-codes) or through computer programs of colorists. Popular encoding systems include directories RAL (usually for commercial vehicles), PPG, DuPont, Mobil and original codes of car manufacturers (Honda, Toyota, BMW, etc.). An error in one digit of the code can lead to the purchase of a can with a completely different shade, which will differ even upon visual inspection.
| Manufacturer | Example code | Where to look | Features |
|---|---|---|---|
| Toyota / Lexus | 040 (Super White) | Door pillar, engine compartment plate | Often requires triple application technology |
| BMW | 300 (Alpine White) | B-pillar, arch, under the hood | Multi-layered complex colors |
| VAG (VW, Audi) | LC9A (Tornado Red) | In the trunk, in the spare tire niche | The code often starts with LC or LY |
| Ford | YZ (Oxford White) | Door pillar, end part | Two-digit and three-digit codes |
It is important to understand that even if you know the exact code, you may encounter the effect of the car’s original paint fading. That's why professional colorists always do paint (test spraying) and compare it with the body under different lighting conditions. Computer selection is just a starting point, requiring manual adjustment by a master.
Where to find color markings on a car
Finding the nameplate is the first step to a successful repair. The location of this information sticker or metal plate is strictly regulated for each brand, but has its own characteristics. Most often, look for a sign on the body pillars (center or front), in the driver's door opening, or under the hood on the mudguard.
The plate contains a lot of information: VIN number, permissible axle loads, tire pressure and, in fact, the paint code. The required combination can be signed as Color, Paint, C/TR (Color/Trim) or just stand as a separate block of 3-4 characters. Some brands such as Mercedes or BMW, the code may be duplicated in the service book or on the end of the trunk lid.
☑️ Where to look for paint code
If the plate is missing or erased (which often happens on older cars), you can try to find the code through the VIN number in specialized online databases or contact an official dealer. However, it is worth considering that over the years of operation the car could have been repainted, and the factory code will no longer correspond to the actual color on the body. In such cases, only computer selection based on a sample helps.
⚠️ Attention: Don't just rely on the color name in the documents. The inscription “Silver” can hide dozens of shades with different codes, which are visually almost the same, but when mixed they give different results.
Application and drying technologies
The process of turning liquid enamel into a hard coating is called polymerization. Depending on the type of paint, this process can occur in different ways. For most repair enamels it is used chemical drying using a hardener. When mixing the base and hardener, an irreversible chemical reaction begins, so the prepared mixture must be used within a certain time (pot life of the mixture).
There is also the concept of “drying” in a chamber. Although acrylic enamels can dry at room temperature, heating in an infrared chamber or using fan heaters significantly speeds up the process and increases the hardness of the coating. The drying temperature is usually 60°C, which reduces repair time from several days to several hours. Metallicas they also require a preliminary “rest”—time for the solvent to evaporate before applying the varnish.
The main rule of drying: Observe the temperature regime. Paint that is under-dried will be soft and prone to scratches, while paint that is overheated may become cloudy or blister.
An important parameter is the viscosity of the paint, which is adjusted by adding a solvent. For different temperature conditions and sizes of the part to be painted, use fast, normal or slow solvents. Using a fast solvent on a large part in the heat will result in shagreen (orange peel), and a slow solvent on a small part in the cold will prevent the paint from spreading.
Common mistakes when choosing and purchasing
The most common mistake is buying an aerosol can “by eye” in the nearest store. The color rendition in the can often differs from the actual enamel in the can, and the quality of the spray does not allow for an imperceptible transition. In addition, cans often contain all-purpose solvents, which may be too harsh for some types of plastics or older finishes.
The second mistake is ignoring the compatibility of materials. You cannot apply paint based on one solvent over a coating that is sensitive to another type of chemistry. This causes a defect called "lifting" or "puckering" of the old layer. Always check the technical data sheet (TDS) of the product before purchasing.
- 🚫 Solvent savings: Cheap solvent may leave dull spots or take a long time to dry.
- 🚫 Lack of soil: Trying to apply enamel directly to metal without an acid or epoxy primer will result in corrosion.
- 🚫 Incorrect proportion: Violation of the base:hardener ratio makes the coating either brittle or sticky.
⚠️ Attention: Some modern three-layer colors (for example, Mazda white pearl or Candy red) cannot be accurately reproduced in a garage without experience and special equipment.
You should also beware of fakes. Popular brands are often copied, bottling cheap analogues in original containers. Buy materials only from authorized dealers and ask for certificates of conformity. Cheap paint can not only fade quickly, but also fail to provide anti-corrosion protection for the body.
Expert advice: Before buying a large batch of paint for a complete repaint, buy the minimum volume (100-200 ml) and do a test paint on a metal plate. Compare the result with the body in daylight.
FAQ: Frequently asked questions
Is it possible to mix paint from different manufacturers?
It is strictly not recommended to mix bases (enamels) of different brands, as their chemical composition and types of resins may differ, which will lead to delamination. However, solvents and hardeners are often interchangeable if they are suitable for the type (for example, acrylic).
How long does it take for car enamel to dry?
Touch-drying time ranges from 15 to 30 minutes. Complete polymerization (strength gain) takes from 24 hours to 7-14 days, depending on the type of paint, ambient temperature and the presence of heating.
What to do if the paint code is not readable?
If the plate is destroyed by corrosion, use the VIN code to request it from the dealer or contact a specialized color studio. They can match the color to a sample (such as a gas tank flap) using a spectrophotometer.
What is the difference between paint for plastic and paint for metal?
Paints for flexible elements (bumpers) contain special elastic additives (plasticizers), which allow the coating to stretch along with the plastic and not crack upon impact. Ordinary enamel on plastic will quickly become covered with a network of cracks.
Do I need to remove rust before painting?
Yes, definitely. Paint does not stop corrosion, it only preserves the surface. If the rust is not removed mechanically and treated with a converter or acid primer, the rotting process will continue under a new coat of paint.