Restoring a car to its original appearance after an accident or eliminating local damage is a task that requires not only technical skills, but also precision in detail. The most difficult stage is often car paint color selection, since even a minimal deviation in shade will be noticeable against the general background of the body. The car owner must understand that simply buying a jar with the name of the color is not enough, because factory enamels tend to fade and change tone over time.
The tinting process requires a professional approach and the use of specialized equipment. In this article we will look at all the intricacies of searching for the factory code, methods of computer selection and manual mixing of components. You'll find out why metallic and mother of pearl more difficult to restore than conventional acrylic enamels, and what tools are needed for an ideal result.
Modern technologies make it possible to recreate any shade with high accuracy, but the human factor and the condition of the source materials play a decisive role. Understanding the chemistry of the processes and proper surface preparation is the key to ensuring that the painted part blends in with the rest of the body.
Finding Factory Paint Code
The first and most important step is to locate the color identification number assigned by the manufacturer when the vehicle was released. This code is a combination of letters and numbers unique to a specific shade in the brand's line. You can find it on a special metal plate or sticker located in various places on the body, depending on the make of the model.
Most often, manufacturers place nameplates in the engine compartment, on door pillars or in the luggage compartment. For example, in cars VAG Group (Volkswagen, Audi) the code is often stamped on the inside of the trunk lid or in the spare wheel well. Japanese brands such as Toyota or Nissan, the label is usually located on the B-pillar on the driver's side.
- 🔍 Carefully inspect all stickers in the engine compartment, looking for the “C/TR” or “Paint” field.
- 📸 Take a high-quality photo of the sign in good lighting to read the small symbols.
- 📖 Refer to the instruction manual for the exact location of the nameplate for your model.
- 💻 Use online VIN catalogs if the physical plate is missing or unreadable.
Sometimes the paint code can be duplicated in the service book or on receipts from previous services from an authorized dealer. If the car has a complex ownership history, it is worth checking for factory stickers that may have been re-glued or painted over. In case of complete loss of information, only spectral analysis of the sample remains.
⚠️ Attention: Do not confuse the exterior color code with the interior color code or equipment code. They are usually located next to each other, but have different designations (for example, "EXT PNT" for external panels).
After receiving the code, you need to double-check it in catalogs, since the same digital index from different manufacturers can mean completely different colors. Accuracy at this stage is critically important, because a mistake in one number will lead to the purchase of the wrong enamel.
Computer selection methods
Modern computer selection paint is a highly precise process based on the use of spectrophotometers and specialized software. The equipment reads the reflected light from the surface of the car and compares it with a database of formulas, taking into account the degree of fading and aging of the paintwork. This allows you to get a formula that is as close as possible to the current state of the car, and not to the factory standard.
The process begins with careful preparation of the measurement site: the surface must be clean, dry and free of traces of polish or wax. The colorist takes measurements at several points to account for uneven burnout, which often occurs on horizontal and vertical planes. The program analyzes the data and offers a recipe for mixing base pigments.
It is important to understand that even computer selection requires subsequent verification and, possibly, (fine-tuning) by a colorist. Software algorithms cannot always take into account metallic luster or the depth of the pearlescent effect, which are visible only to the human eye at a certain angle of incidence of light. Therefore, the final finishing of the shade is often done manually by an experienced craftsman.
⚠️ Attention: Computer selection is powerless if the car was previously painted poorly or non-original materials were used. In such cases the formula will be incorrect.
The result of the work is ready-to-use enamel, which is applied to a test plate (paint) for visual comparison with the body. Only after the paint has been approved, the master begins to prepare the main volume of paint for painting the part.
Manual tinting and spectral analysis
In situations where computer selection is impossible or produces errors, the method of manual tinting or spectral analysis is used. A spectrum analyzer is a handheld device that reads the reflected spectrum of light and provides a percentage of the components. It is a more accurate tool than visual assessment, but it also requires proper use.
Hand tinting is the domain of highly skilled craftsmen who have spent years developing a sense of color. The process involves the gradual addition of micro-doses of pigments to the main base and constant comparison with the standard. For work, precise scales with 0.01 gram increments and a set of pure basic colors are used.
- ⚖️ Weighing of components is carried out with high precision down to the milligram.
- 🎨 Mixing is carried out in a transparent container to evaluate the color against light.
- ☀️ Color testing is carried out in daylight and artificial lighting (metamerism).
- 🖌️ Applying a sample to a metal plate in compliance with spray technology.
Particularly difficult is working with complex colors, such as “chameleon” or three-layer mother-of-pearl. Here it is important not only to match the color of the base, but also to correctly reproduce the number and size of flakes (particles) in the varnish layer or base pigment. An error in the concentration of aluminum powder can make the color darker or lighter.
What is color metamerism?
Metamerism is an effect in which two samples appear the same color under one light source (such as daylight) and different colors under another (such as a street lamp). This is a property of pigments that must be taken into account when selecting.
For successful manual tinting, you need to have on hand a fan of colors (palette) from a specific paint manufacturer, since the same names may differ among different brands. Usage solvents and thinners also affect the final shade, so the proportions must be strictly observed according to technology.
Specific selection for different types of enamels
Different types of automotive enamels require an individual approach to selection and application. Acrylic paints that do not require varnish are usually easier to work with, but more difficult to match accurately due to the lack of a protective layer of varnish that gives depth. Metallics and pearls depend on the orientation of the particles, which creates the effect of changing color depending on the viewing angle.
When working with metallics, it is critical to maintain the pressure in the spray gun, the distance to the surface and the speed of travel. If the application technology is violated, the aluminum powder will not lie correctly, and the color will appear “dirty” or differ from neighboring parts, even if the chemical composition is ideal.
| Paint type | Features of selection | Difficulty | The need for varnish |
|---|---|---|---|
| Acrylic (Solid) | It’s easier to get into tone, but the transitions are noticeable | Low | No (usually) |
| Metallic (Basecoat) | Depends on the orientation of aluminum particles | Average | Required |
| Mother of pearl | Three-layer system, complex structure | High | Required |
| Kandy | Transparent color over metal, difficult to repair | Very high | Required |
Three layer colors such as Red Mica or White Pearl, consist of a primer, an effect base and a transparent color layer. It is almost impossible to select such a color “in a can” without losing the effect, so blending technology is often used to adjacent body elements.
For complex three-layer colors (mother of pearl, kandy), local painting almost always requires stretching (transition) to an adjacent part to make the repair invisible.
Tools and materials for color testing
To check the quality of the selected paint, it is not enough just to look at the can. Professionals use a range of tools to evaluate color under different conditions. The main tool is a fluorescent lamp, simulating solar radiation, since in ordinary room light the eye can make mistakes.
A degreaser and clean wipes are also needed to prepare the reference surface. Dust or grease on the body can distort the perception of color. To apply the sample, a special sprayer or airbrush is used to reproduce the texture of factory spraying.
☑️ Checking the selected color
It is important to allow the paint to dry completely and, if required, varnish before final grading. Wet paint always looks darker and richer than dry paint. Waiting for complete polymerization (especially for acrylics) can take from several hours to a day, but an express check can be done after drying to touch.
⚠️ Attention: Never judge the color of freshly applied wet paint. Wait until the solvent evaporates, otherwise you will get a false impression of the shade.
Using a magnifying glass or macro photography on your phone can help you see the grain structure of metallics. If the size or quantity of glitter differs from the factory sample, the color will play differently, even if the pigment part is 100% the same.
Painting nuances and transitions
Even perfectly selected paint may look different on the body due to the application technology and the condition of the old coating. A situation often arises when the new layer is different from the burned out old one. In such cases, the blending painting method is used, when new paint is smoothly shaded onto the adjacent part.
To implement the transition, a special adapter solvent is used, which allows you to blur the boundary of the new layer. This requires high skill of the painter, since it is necessary to seamlessly combine the new enamel with the old one, maintaining the gloss and structure. Improperly performing the transition can lead to clouding of the varnish or peeling of the material.
When painting transitions, always use a special transition thinner, not regular thinner. It dries slower and allows you to make the color border as smooth and invisible as possible.
It is also worth considering that new paint always looks brighter and richer. Over time, under the influence of ultraviolet radiation and reagents, it will become equal to the rest of the body. However, in the first weeks the difference may be noticeable, especially on dark colors such as black or navy blue.
In some cases, if the difference in color is too large and cannot be removed by transition, the only solution is to repaint the entire element or even half of the body (pol-panel). It's expensive, but it guarantees a uniform color throughout the entire surface of the car.
Why are black cars the hardest to paint?
Black color (especially Black Pearl) does not forgive mistakes in preparation and application. Any risks, dust and “apple-likeness” (unevenness) are visible on it. In addition, the black color fades a lot, and it is extremely difficult to find the exact formula for an old car.
Frequently asked questions (FAQ)
Is it possible to choose the color of a car using only the VIN code?
Technically, the VIN indicates the factory color the car left the assembly line in. However, over years of use, the paint fades, and a new layer, mixed strictly according to the factory formula, may differ from the current condition of the body. For an ideal result, you need spectral analysis or tinting based on a sample.
How long does the computer selection process take?
The process of measuring with a spectrophotometer and calculating the formula takes 15-30 minutes. However, making the color, drying it and comparing it can take from 1 to 3 hours, depending on the type of paint and the workload of the colorist.
Why is the selected paint different on the plate and on the machine?
This may be due to metamerism (different lighting), layer thickness, spray pressure or temperature. The plate and the part must be compared under identical conditions, preferably in daylight, and take into account that the coating texture on the plate may differ from the body one.
What to do if the paint code on the plate is not readable?
If the decal is damaged, you can try to find a duplicate decal (often found under the trunk mat or in the glove compartment). As a last resort, cut off a small sample of paint in an inconspicuous place (for example, under a door seal) and take it to the laboratory for spectral analysis.