The choice of paint coating (LPC) is a critically important stage in the restoration of a car, which determines not only the appearance, but also the durability of the metal’s protection from corrosion. The market offers a huge number of options, and without a deep understanding of the chemistry of the processes, it is easy to get confused in the variety of jars, codes and two-component systems. Wrong selection of car paint can lead to the fact that after a few months the coating begins to peel off, fade or change color, negating all efforts and financial costs.
In this article we will analyze in detail the main types of automotive enamels, consider popular brands and give practical recommendations on the choice of materials. You will learn the difference between acrylic and polyurethane, why metallic requires mandatory varnishing and how to read technical documentation correctly. A competent approach to choosing materials at the start will save you nerves and money in the future.
First of all, it is necessary to determine the purpose of the repair: local touch-up of a chip or complete repainting of the body element? The choice of the type of enamel and the method of its application directly depends on this. Professional results often require the use of compressor and a spray gun, although some modern materials allow application by aerosol.
Main types of automotive enamels
The fundamental difference lies in the chemical basis of the coating. Historically, nitrocellulose enamels were the first to be widely used, which dried quickly but had low durability. Today, acrylic and polyurethane compositions have become the de facto standard. Acrylic paints (acrylates) are valued for their high hiding power, excellent gloss and ease of polishing. They form a durable film that is resistant to atmospheric influences.
Polyurethane enamels are considered more modern and wear-resistant. They have increased elasticity, which allows the body to withstand vibrations and thermal expansion without the formation of microcracks. However, working with them requires strict adherence to mixing proportions with the hardener. One-component compositions dry due to the evaporation of the solvent, whereas two-component (2K) undergo an irreversible chemical reaction after the addition of a catalyst.
Water-soluble paints deserve special attention, they are gaining popularity due to environmental regulations, but require specific equipment for drying and application. In garage conditions, solvent (based on organic solvents) systems are most often used. The choice between them depends on the availability of infrastructure in the paint shop.
It is important to note that for some effects, such as mother of pearl or complex three-layer colors, the application technology may differ radically from the standard “base + varnish” scheme. In such cases, saving on materials is unacceptable, since it is almost impossible to reproduce the color depth with cheap analogues.
Selection criteria: base, varnish and solvents
When creating your budget and shopping list, you can't forget that paint is only part of the equation. A high-quality result is impossible without the right varnish and solvent. The varnish creates a protective layer, absorbing the impacts of small stones and exposure to ultraviolet radiation. Cheap varnish quickly becomes cloudy and becomes covered with a network of cracks known as “cobwebs.”
The solvent (thinner) is selected depending on the ambient temperature and the area of the surface to be painted. There are fast, standard and slow solvents. Usage fast solvent in the heat will cause the paint to dry while still in the spray gun’s torch, creating shagreen (“orange peel”). Slow solvent in a cold room can cause drips and long drying times.
⚠️ Attention: Never mix solvents from different manufacturers with paint base. Chemical incompatibility can lead to the curling of the enamel directly in the spray gun tank or the appearance of dull spots after drying.
The selection of hardener for two-component systems is also critical. It comes in different polymerization rates. For large areas and high temperatures in the chamber, a slow hardener is used in order to have time to apply the material without defects. For minor repairs or work in the cold - fast. Dosing accuracy hardener must be maintained to the nearest gram, otherwise the coating will either not adhere or become too brittle.
Buy solvent and hardener from the same brand as the paint itself. This ensures chemical compatibility of all system components.
Comparison of popular car enamels brands
The market for body repair materials is saturated with both premium European brands and affordable analogues. Industry leaders such as Mobihel, PPG, Spies Hecker and Sikkens, set quality standards. Their products are characterized by color stability, excellent spreadability and predictable drying behavior. However, the price of these materials can be 2-3 times higher than that of budget analogues.
Mid-price brands, e.g. Vika (Russia) or Body (Greece), are often used in the mass segment of car services. They offer good value for money, especially for cars between 5-7 years old. For budget repairs or painting of internal elements (doorways, thresholds) this is an excellent choice.
Below is a comparison table of the characteristics of popular brands available in the market:
| Brand | Country | Typical Application | Price segment |
|---|---|---|---|
| Mobihel | Slovenia | Professional painting, complex colors | High |
| PPG | USA/Europe | Factory standards, premium repairs | Premium |
| Body | Greece | Garage repair, anticorrosive, primers | Medium |
| Vika | Russia | Budget repairs, commercial vehicles | Budget |
| Sikkens | Netherlands | Restoration, high resistance to fading | High |
When choosing between an expensive and a cheap brand, it is worth considering the cost of work. If you're paying a professional painter by the hour, saving on a can of paint could mean repainting the item a year later, doubling the cost. For your own needs, when time is not so critical, you can experiment with more affordable options.
Specifics of color selection and tinting
Selecting paint is not just about buying a can with the right code. Over the years of use, the factory paintwork fades, wears out and changes color. Therefore, paint selected strictly according to the color code (for example, 1G3 for Toyota or NH-700M for Honda), may be visually different from the rest of the body. This process is called aging of the coating.
A professional colorist uses a spectrophotometer to analyze the current body color and makes adjustments to the formulation. Computer selection allows you to create a mix that, when sprayed correctly (taking into account the size of the torch and pressure), will merge with the main color. Metallicas and nacres are especially sensitive to the direction and intensity of spraying.
Why is the color on the fan different from the color on the car?
In a fan, the pigments are located in one layer, and when painting, particles of aluminum or mica lie chaotically. In addition, the fan is printed on paper, rather than on metal with primer and varnish, which changes the light reflection.
When ordering a matching service, be sure to bring with you a removable body part (gas tank cap, gas tank flap) so that the colorist can evaluate the color in different lighting. Visual evaluation in daylight and under lamp is critical for complex three-layer colors such as red mother of pearl or "chameleon".
Required tools and surface preparation
Even the most expensive paint will not apply well if the surface is not prepared. The basis for success is 80% preparation and 20% painting. You will need a set of abrasives: sandpaper grades from P80 to P2000, degreaser (anti-silicone) and sticky wipes to remove dust.
To apply materials, you need a compressor with a capacity of at least 200-250 liters per minute and a spray gun (HVLP or LVMP). Cheap electric spray guns produce large shagreen grains and a lot of fog, which increases material consumption. High quality torch allows you to control spreading and avoid overspray.
☑️ Checklist before painting
Don't forget about personal protective equipment. Solvent vapors and varnish dust are toxic. A respirator with class A carbon filters is a mandatory attribute for a painter. Nitrile gloves and a protective suit are also required, since it is extremely difficult to wash off polyurethane enamel that gets on the skin, and it poses a serious danger to the eyes.
Application technology and typical mistakes
The painting process requires adherence to time intervals. Interlayer drying (curing) is usually 10-15 minutes at a temperature of 20°C. If you apply the next coat too early, the solvent will not have time to evaporate and bubbles or “boiling” will appear on the surface. If you overexpose it, interlayer adhesion may be disrupted.
One of the most common mistakes is incorrect distance to the surface. You need to hold the spray gun at a distance of 15-20 cm perpendicular to the plane. Movements should be smooth, overlapping the previous pass by 50%. Sudden movements or changes in angle result in streaks and uneven distribution. metallized pigment.
⚠️ Attention: Do not try to cover the primer or the old color “to zero” in one pass. This is guaranteed to lead to drips. It is better to apply 2-3 thin layers with the correct exposure than one greasy one, which will have to be rubbed out.
The final stage is applying varnish. The varnish is applied in 2 layers (wet on wet). The first layer is a binder, thin. The second is the main, glossy one. It is important to catch the moment when the first layer has become matte, but still sticky. After complete drying (usually 24 hours), the surface is ready for polishing.
The quality of painting depends 70% on surface preparation and 30% on application technique. Don't skimp on sanding and degreasing.
FAQ: Frequently asked questions
Is it possible to paint with acrylic over nitro enamel?
Strongly not recommended without careful testing. Acrylic solvents can be aggressive and “lift” the old nitro layer, creating wrinkles. It is necessary to either completely remove the old coating down to the metal, or apply an insulating primer, or do a compatibility test in an inconspicuous area.
How long does it take for paint to dry in a garage?
Touch drying time is 30-60 minutes at +20°C. However, complete polymerization (hardening) takes from 7 to 14 days. During this period, it is better not to wash the car or expose it to stress.
Does the paint need to be heated before application?
Yes, the temperature of the materials (paint, varnish, solvent) and the body surface should be the same, ideally 20-22°C. Cold paint is thicker, it spreads worse and produces larger shagreen. The jars must be kept in a warm room for at least a day.
What is “appleness” and how to avoid it?
"Apple" is a mottled color characteristic of metallics. Occurs due to the uneven distribution of aluminum particles. To avoid this, you need to use the right solvent, maintain the pressure at the spray gun outlet, and apply a finishing coat (“fog coat”) to align the pigment orientation.