The condition of the wheels is one of the main factors that form the overall impression of the car, because they are the first to catch the eye when visually inspecting. However, the harsh realities of operation on domestic roads, constant contact with aggressive chemical reagents and abrasive dust lead to the rapid destruction of the factory surface. Car lacquer It is not just a decorative element, but a necessary protective barrier that prevents corrosion of metal and preserves the presentable appearance of the wheels for many years.
Many car owners mistakenly believe that if the disc has no visible damage, then additional processing is not required, ignoring the microcracks through which moisture penetrates to the structure of the alloy. High-quality lacquer coating is able to withstand extreme temperature changes that occur during braking, and to withstand the impacts of small stones flying from under the wheels in front of the transport. In this article, we will discuss in detail what compositions exist on the modern market, how to properly prepare the surface and what application technology should be adhered to to achieve the ideal result.
Why do we need to varnish wheels
The main function of the varnish is to create a durable, inert film that completely isolates the metal from the external environment, including moisture, oxygen and road chemistry. Without such protection, even small chips on cast discs quickly turn into corrosion foci, which over time can lead to loss of tightness and depressurization of the tire. Polyurethane and acrylic compounds have high adhesion and elasticity, which allows the coating to stretch and contract with the metal when heated, without cracking.
In addition, varnishing greatly simplifies the care of the wheels, as a smooth surface repels brake dust and dirt, making washing a quick and effective procedure. If you plan to use it special brake cleanersThe presence of a lacquer layer will protect the metal from direct contact with aggressive chemistry, which otherwise could cause tarnishing or oxidation of the surface.
⚠️ Attention: The use of aggressive acid cleaners on damaged lacquer can lead to irreversible clouding of the surface and the rapid development of film corrosion.
It is important to understand that the restoration of the protective layer is a preventive measure that is much cheaper than buying new discs or complex restoration in a specialized center. Regular processing allows you to maintain the liquidity of the car when selling, as buyers always pay attention to the condition of the wheel arch.
Types of varnishes for car discs
The autochemistry market offers a wide range of solutions, and the choice of a particular product depends on the disc material, operating conditions and desired visual effect. Most often, car owners and masters face the need to choose between acrylic and polyurethane compounds, each of which has its own unique characteristics and application area.
Acrylic varnishes are popular due to their affordable price and ease of application, as they are often produced in aerosol cylinders, which is convenient for home use. They dry quickly, have good gloss and are great for protecting stamped discs or cast models that are not subjected to extreme loads. However, their resistance to mechanical damage and chemical reagents is inferior to more expensive analogues, so you will have to update the coating more often.
Polyurethane formulations are considered a professional standard in body repair and restoration of wheels, ensuring maximum strength and durability of the coating. They form an extremely hard but elastic film, resistant to gravel impacts, scratches and the effects of gasoline or oils. To work with polyurethane The compressor and spray gun are often required, as the mixing of the components must occur immediately before application.
Separately, it is worth mentioning heat-resistant varnishes, which are specially designed for areas with increased thermal exposure, for example, for the internal surfaces of discs or calipers. These compounds are able to withstand heating to several hundred degrees Celsius without changing color and loss of protective properties, which is critical for sports cars.
Necessary tools and surface preparation
The quality of the final result depends on 80% on how competently and carefully the preparatory work was carried out, including the complete removal of old coating, dirt and oxides. Before starting work, it is necessary to dismantle the wheels from the car to ensure access to all hard-to-reach places and avoid materials from hitting the body.
The preparation process begins with a thorough washing of the discs using degreasing and brushes, followed by a stage of mechanical cleaning of damaged areas. To remove deep scratches and traces of corrosion, sandpaper of various grains is used, ranging from P240 for rough processing and ending with P800-P1000 for finish grinding.
☑️ Checklist for varnishing preparation
After machining, the surface is necessarily degreased with an antisilicone or a special degreasing agent to prevent fat spots from entering the varnish, which can cause detachment. It is important to work in a well-ventilated room with low humidity, as condensation on the metal surface can lead to turbidity of the varnish or defects.
Paint tape and cover film are used to protect tires and suspension elements from accidental ingestion of paint and varnish. Disc temperature and ambient temperature should be strictly within 18-25 degrees Celsius.Applying materials to cold or superheated metal will disrupt the polymerization process.
Technology of applying varnish with their own hands
The process of applying the varnish requires accuracy, compliance with the time intervals of drying and the correct technique of movement of the sprayer or brush. If you use an aerosol cylinder, it must be preheated to room temperature and thoroughly shake the contents for 2-3 minutes before the sound of the metal ball appears.
The application is made in several thin layers, and the first layer is made very light, almost "fog" to create a basis for the adhesion of the subsequent layers. Between the application of each layer, it is necessary to maintain a pause specified by the manufacturer on the package (usually 10-15 minutes) so that the solvent has time to partially evaporate.
| Parameter | First layer | Second layer | Third layer (finished) |
|---|---|---|---|
| Thickness | Thin, translucent | Medium, covert | Medium, glossy. |
| Distance | 25-30 cm | 20-25 cm | 20-25 cm |
| Time to dry | 10-15 minutes | 15-20 minutes | 24 hours before operation |
When working with two-component varnishes and spray gun, it is important to properly adjust the spray torch and pressure to avoid overflows and the formation of an “orange peel”. Movements should be smooth, reciprocating, with overlapping the previous passage by 50% to ensure uniform coating thickness.
The secret of the perfect gloss
To obtain a mirror shine, the last layer of varnish can be applied with the addition of a small amount of solvent (5-10%), which will allow the coating to spread better before drying.
Drying and polymerization of coatings
Proper drying is a critical step, which depends on the strength and durability of the lacquer coating, as premature exposure to moisture can ruin all previous efforts. Although the varnish may appear dry to the touch within an hour, full polymerization and maximum hardness setup take significantly longer, usually 24 to 72 hours depending on the type of formulation.
At home, the most affordable method of drying is natural drying at room temperature, but you can speed up the process with infrared lamps or heat guns, taking care. Infrared heating allows the metal to warm up evenly, contributing to deeper polymerization of the material, but it is important not to overheat the disk, so as not to cause the varnish to boil.
It is not recommended to install the wheels on the car and subject them to loads until the end of the time of full polymerization specified in the product technical map. Premature contact with water, dirt or mechanical exposure can leave indelible marks on an even soft coating.
⚠️ Warning: Forced drying at too high a temperature can cause bubbles and a change in the shade of the varnish, especially if cheap materials were used.
Frequent mistakes in varnishing and how to avoid them
One of the most common mistakes is insufficient degreasing of the surface, which leads to craters, fish eyes and detachment of the varnish during operation. Even microscopic bitumen or silicone residues can spoil the entire species, so the cleaning step cannot be ignored or performed superficially.
It is also common to apply layers too thick in an attempt to save time, leading to leaks, long drying and possible wrinkling of the coating. Patience. It is a key skill of a painter, and it is better to apply three thin layers with the correct exposure than one greasy one, which will have to be completely washed away.
Use a sticky napkin (antistatic) just before applying the varnish to remove the smallest dust that has settled on the disc after degreasing.
Ignoring temperature and humidity is also a fatal mistake: high humidity causes varnish clouding (the “bleach” effect), and low temperature prevents normal spreading and adhesion. Always check the weather forecast and indoor conditions before starting work.
Care for lacquered discs
To lacquer coating served as long as possible and retain its shine, it is necessary to ensure proper and regular care, excluding the use of abrasive sponges and aggressive chemistry. Washing of wheels should be carried out with a soft brush or mitten, using specialized shampoos with neutral pH, safe for lacquered surfaces.
Every few months, it is recommended to apply protective waxes or ceramic sprays on the discs, which create an additional hydrophobic layer and facilitate the removal of contaminants. Such compositions fill the micropores of the varnish, making the surface more slippery and resistant to sticking brake dust.
When the first signs of damage to the lacquer appear, such as chipping or scratching to the metal, local restoration should be carried out as soon as possible. Use of the polishing with abrasive particles is permissible only for the removal of oxides and easy hologramming, but not for deep defects.
Regular application of protective wax prolongs the life of the lacquer coating by 2-3 times, creating an additional barrier against reagents.
Can I paint the discs directly on the car without removing them?
Theoretically, this is possible, but it is highly recommended because of the high risk of paint hitting the body, brake calipers and tires. In addition, the quality of preparation and drying in this case will be much lower, which will lead to rapid detachment of the coating.
How long does the varnish for the discs dry?
The surface drying time is 30-60 minutes, but full polymerization and operation take 24 to 48 hours depending on the air temperature and thickness of the layers applied.
Do I need to lay the disc before applying the varnish?
If the disc is completely cleaned to metal or has significant damage, the use of acid or epoxy soil is mandatory to prevent corrosion and improve the adhesion of the varnish. On the intact factory coating after grinding, the soil can not be applied.
How to wash the varnish off the disk if you do not like the result?
To remove the varnish, special washes for old coatings (paint stripper) or a mechanical method using a grinding machine and sandpaper of various grains are used.