Restoring a car's paintwork is not just a cosmetic procedure, but a complex technological process that requires precision and understanding of the chemistry of materials. Incorrectly selected enamel may not only not match the tone, but also lead to peeling of the coating after several months of use. A vehicle owner is often faced with a dilemma: trust the eye of the colorist or strictly follow the factory specifications.
In the modern world of auto repair paint selection has become a high-precision science. Manufacturers use hundreds of shades, which can vary depending on the year of manufacture of the model and even the batch of the plant. Ignoring nuances such as the type of solvent or the number of layers of varnish turns a local repair into repainting the entire body. That is why it is important to understand the basic principles of color before starting work.
In this article we will look in detail at how to find VIN code, decipher the factory markings and choose between a ready-made solution and individual tinting. You will learn why “metallic silver” can look completely different from one brand to another and how to avoid common mistakes when purchasing materials.
Identification of factory shade by code
The first and most reliable step to a perfect repair is to find a factory paint code. Car manufacturers assign each shade a unique alphanumeric designation, which allows them to recreate the color with maximum accuracy. This code does not need to be selected visually; it already exists in your car's specifications.
The location of the code plate or sticker varies from brand to model. Most often, the information is located on the driver's side pillar, under the hood on the “TV” or in the spare wheel well. For some models BMW or Mercedes-Benz the code can be stamped directly on the body elements or indicated in the service book.
- 🔍 Check the driver's door pillar - this is the most common place for plates with VIN and option codes.
- 🔍 Look under the hood: look for a sticker on the inside of the hood lid or on the engine compartment partition.
- 🔍 Examine the trunk: sometimes the markings are located under the mat or on the inside of the trunk lid.
However, relying on code alone is sometimes not enough. Over time, the paint fades under the influence of ultraviolet radiation, and a new element, painted strictly according to the recipe, may differ from the rest of the body. Therefore computer selection often includes spectral analysis of the current state of the coating.
⚠️ Attention: The paint code may consist of several parts. For example, the main color code and the coating type code (metallic, pearl). Make sure you count the entire combination of symbols, not just the first part.
If the code plate has become unreadable or was removed during previous repairs, do not despair. There are specialized databases and catalogs where VIN number You can restore the car's paint history. Also, the code is often duplicated in service manuals or on the manufacturer’s website in the support section.
Types of automotive enamels and their features
Understanding paint chemistry is critical to the longevity of your renovation. Modern automotive chemistry offers several main types of coatings, each of which requires its own application and drying technology. Choosing the wrong type can lead to defects such as shagreen or dullness.
The most common are acrylic enamels, alkyd paints and water-based systems. Acrylic compounds are considered the “gold standard” for garage and professional repairs due to their durability and ease of polishing. Alkyd enamels, in turn, are often cheaper, but require the mandatory use of varnish for protection.
The effects added to the base layer deserve special attention. Metallic contains aluminum powder, mother-of-pearl contains mica, and xerallic creates the effect of depth due to countable particles. The application of such paints requires a highly qualified painter, since the direction of the spray gun torch affects the final result. shade.
What is the difference between 1K and 2K inks?
1K (one-component) paints dry by evaporation of the solvent and do not require a hardener. 2K (two-component) chemically react with the hardener to form a much stronger and more durable coating that is virtually unaffected by gasoline and solvents once fully cured.
When choosing a material, it is also worth considering the drying method. Natural drying is suitable for acrylics, but takes a long time. Forced drying in a chamber speeds up the process and increases the hardness of the layer. Some vintage cars may require nitro enamels, which have practically fallen out of mass use due to low environmental friendliness and durability.
| Paint type | Durability | The need for varnish | Difficulty of application |
|---|---|---|---|
| Acrylic (2K) | High | Not required | Average |
| Alkyd (1K) | Average | Required | Low |
| Base coat + Varnish | Very high | Required | High |
| Water based | High | Required | Very high |
Computer tinting or ready-made jar
Before purchasing materials, the car owner is faced with a choice: purchase a ready-made aerosol or can of paint according to the code, or order an individual tinting. Off-the-shelf solutions seem simpler, but they rarely take into account the degree of fading of your specific car's old coating.
Computer tinting allows you to mix pigments to obtain a shade that perfectly matches the current state of the body. The colorist mixes components by weight using high-precision scales and software. This is especially true for complex colors such as chameleon or three-layer mother-of-pearl.
- 🎨 Ready-made paint is cheaper, but the risk of tone mismatch (“multi-tone”) is up to 40% on cars older than 3 years.
- 🎨 Tinting is more expensive, but guarantees color matching, taking into account the aging of the paintwork.
- 🎨 Aerosol cans are convenient for small chips, but provide a thinner layer than a spray gun.
It is important to note that even with computer selection it is necessary to do paint (test application) on a metal plate. After drying and applying the varnish, the plate is applied to the body to evaluate the match under different lighting conditions. Only after the paint has been approved can you begin painting the part.
⚠️ Attention: Never start painting the entire part without doing a test paint. Light in the workshop and sunlight outside can dramatically change the perception of color, and a mistake can be costly.
If you choose the DIY route, make sure the seller provides an option for returns or color correction if unsuccessful. Professional color stores often offer this service, which reduces financial risks when local repairs.
Required tools and supplies
The quality of painting depends 50% on the paint and 50% on preparation and tools. Even the most expensive material will deteriorate if applied with a dirty spray gun or in a dusty room. Therefore, creating a shopping list is a critical planning step.
First of all, you will need a spray bottle. System spray guns are used for base coats and varnishes HVLP (High Volume Low Pressure) or LVLP (Low Volume Low Pressure). They provide a high percentage of material transfer and minimize the formation of fog, which saves paint.
In addition to the basic equipment, a number of consumables are required. These are funnel filters, masking tape, covering paper or film, degreaser and anti-silicone. Ignoring the degreasing step will result in the paint appearing in “craters” or not sticking to the surface at all.
List of minimum required materials:1. Paint (base coat or acrylic)
2. Solvent (correct drying speed)
3. Filler primer (if there are unevennesses)
4. Varnish (2K) and hardener
5. Masking tape and paper
6. Degreaser and wipes
Don't forget about personal protective equipment. Solvent vapors and paint dust are toxic. A respirator with carbon filters, safety glasses and a special painter's suit are required to maintain health. Save on security absolutely not possible.
Use the same brand of thinner as the paint. Mixing products from different brands may result in a chemical reaction, curdling of paint, or changes in drying time.
Surface preparation technology for painting
Body preparation is the foundation of the future coating. If you skip this stage, no paint, even the most expensive, will hide the defects, and over time it will simply peel off. The process begins with washing and cleaning the repaired area from dirt, bitumen and silicone.
Next comes mechanical processing. The old coating is cleaned off with abrasive. If there are pockets of corrosion, they are removed to bare metal, treated with a rust converter and primed. To level out small irregularities, automotive putty is used, which is then sanded.
The key is to create a “step” or smooth transition between the old and new coating. Sharp boundaries will be noticeable even under a layer of paint. Grinding is carried out sequentially: from coarse grain (P80-P120) to fine grain (P240-P320) under the primer and P400-P500 under the base.
- 🛠️ Thoroughly degrease the surface before applying primer using lint-free wipes.
- 🛠️ Blow all cracks and joints with compressed air to prevent dust from coming out during drying.
- 🛠️ Use a sticky napkin (antistatic) immediately before painting to remove microdust.
⚠️ Attention: Do not sand the primer too hard. If you scrape it down to the metal, you run the risk of oxidation and corrosion underneath the paint, and may also show the outline of the putty.
After preparation, the surface is degreased again. It is important not to touch the prepared area with your hands, as sebum will disrupt adhesion. The car is now ready for application soil and subsequent painting.
Application process and drying of the coating
Applying paint requires skill and distance. The spray gun is held perpendicular to the surface at a distance of 15-20 cm. Movements should be uniform, overlapping the previous strip by 50%. The first base coat is applied in a thin, “spraying” layer to ensure adhesion.
After the first coat has dried (usually 10-15 minutes), apply a second, wetter coat to cover the color and remove streaks. Metallics and pearls may require a third coat to achieve the effect. It is important not to overfill the material, otherwise drips cannot be avoided.
The final stage is applying varnish. The varnish protects the base from ultraviolet radiation and mechanical influences. It is applied in 2-3 layers with interlayer aging. It is the varnish that gives depth of color and glossy shine. After complete polymerization (from 24 hours to several days), the surface is polished.
☑️ Checklist before starting painting
Drying is a critical process. When drying naturally, it is important to avoid drafts and dust. Drying in the chamber is faster and better. Complete polymerization of two-component materials takes up to 7-14 days, during which it is not recommended to wash the car with abrasive chemicals.
Frequently asked questions (FAQ)
Is it possible to paint a car a different color without removing the old coating?
Technically this is possible, but it is highly not recommended. Old paint may react with new paint, blistering, or peeling off. In addition, when repainting in a contrasting color (for example, from black to white), you will have to remove the doors and jambs, which will turn into a complete repaint of the body. It is better to use colors close to the original, or completely remove the old paintwork.
How long does it take for paint to dry in a garage?
The “dust off” time (when the dust no longer sticks) is about 30-60 minutes. However, the car can be used no earlier than after 24 hours. Full hardness, allowing polishing, occurs after 3-7 days, depending on the air temperature and the type of hardener.
Why did shagreen (orange peel) appear after painting?
Shagreen occurs due to incorrect paint viscosity, too rapid evaporation of the solvent, insufficient pressure in the spray gun or incorrect application distance. Poor surface preparation or low room temperature may also be the cause.
Do I need to remove handles and mirrors when painting locally?
For an ideal result and an imperceptible transition (“to zero”), it is better to remove the elements. If painting is done “in place” (spot), then dismantling is not necessary, but very high-quality gluing and polishing of the transition border is required.
What to do if the paint bubbles immediately after application?
This is a sign of solvent boiling or reaction with silicone/oil. It is necessary to allow the coating to dry completely, then sand the defect to an even state, thoroughly degrease and reapply, following the technology.