The question of which paint for discs is better, arises before every car owner who decided to refresh the appearance of the wheels or hide traces of corrosion. The market offers many solutions, from classic aerosols to complex two-component formulations requiring professional equipment. The choice depends not only on the budget, but also on the operating conditions of the car and the desired durability of the result.
Incorrectly selected coating can peel off after the first winter with reagents or scratch when washing. To avoid rework and unnecessary costs, it is necessary to understand the chemical composition of materials and technologies for their application. In this article, we will conduct a detailed analysis of popular types of paints and determine what will suit your car.
Basic requirements for wheel cover
Wheel drives are subjected to extreme loads that no other part of the body does. This dictates strict requirements for the choice of paint material. Heat resistance This is the first critical parameter, since the brake mechanisms during active driving or descent from the mountains can be heated to 200-300 degrees Celsius. Ordinary enamel in such conditions will rise and lose color.
The second important factor is chemical resistance. In winter, roads are treated with aggressive reagents, and in summer, bitumen and oil get on the discs. The coating must be inert to these substances. It's important. mechanical strength: the ability to withstand the impact of small stones and gravel, flying from under the wheels in front of the cars at high speed.
Do not forget about adhesion, that is, the ability of the paint to firmly adhere to the material of the disk, whether it is cast aluminum or stamped steel. Liquid rubberFor example, it has excellent adhesion, but low heat resistance, whereas epoxy They provide perfect grip, but require careful surface preparation.
⚠️ Warning: Never use conventional interior paints or enamel for radiators on discs. They will not withstand the heat from the brakes and will begin to crumble after a week of operation.
There is no universal solution for all, but there are optimal options for specific tasks. If you plan to drive only in the summer around the city, the requirements will be the same, and for an SUV that constantly storms fords, you need completely different materials.
Powder paint: the standard of durability
When it comes to which paint for discs is best in terms of durability, professionals most often call powder paint. It is a dry powder consisting of polymer resins, pigments and hardeners. The application technology involves electrostatic spraying of particles on the grounded disk with subsequent baking in the oven at a temperature of about 200 degrees.
As a result of polymerization, a monolithic, super-strong film is formed. She has a phenomenal character. wear-resistant And it's practically immune to chips. The chemical inertness of this coating allows it to resist the effects of road reagents and alkaline shampoos on sinks for years. It is the powder paint that paints most of the disks on the factory conveyor.
However, this technology has its nuances. It is almost impossible to apply a high-quality powder coating in garage conditions due to the need to use a special spray chamber and a polymerization furnace. This makes this method the most expensive, as it requires a special service.
- 🛡️ Incredible resistance to mechanical damage and chips.
- 🔥 High heat resistance, withstands heating from the brake system.
- 💰 High cost of work and the need for professional equipment.
- 🏭 Difficulty with local repairs: It is often necessary to repaint the entire disk.
If you are looking for a solution “made and forgotten for 5 years”, then powder painting is your choice. Despite the high initial cost, in terms of service life, it is more economically profitable than the annual dyeing with cheap aerosols.
Powder painting is an investment in durability that requires professional equipment and is impossible to perform at home.
Acrylic enamel: balance of price and quality
Acrylic paints occupy an intermediate niche between professional powder painting and budget solutions. They are available in the form of two-component compositions (basic + hardener) or finished aerosols. Acrylic resin provides glossy shine and good cover, allowing you to hide small surface defects.
The main advantage of acrylic is the possibility of high-quality application with your own hands. For work, you do not need a furnace, clean room is enough and drying temperature is observed. Two-component acrylic enamels, requiring mixing with a hardener immediately before application, create a fairly durable coating that lasts 2-3 years.
However, acrylic is softer than powdered polymer. It is easier to scratch brushes on automatic washes and can fade under the influence of ultraviolet light, if not covered with high-quality varnish. Heat resistance acrylic enamels are average: they withstand standard heating, but with extreme overheating, the brakes can change color or turn yellow.
When choosing acrylic, it is important to pay attention to the presence of UV filters in the composition. Cheap options quickly fade in the sun, losing color saturation. High-quality car acrylics retain their original shade much longer.
| Characteristics | Powder paint | Acrylic enamel | Liquid rubber |
|---|---|---|---|
| Term of service | 5-7 years and more | 2-3 years | Season 1 (under 1 year) |
| Difficulty applying | Only the pros. | Medium (you can do it yourself) | Low (easy on your own) |
| Resistance to chips | Very high. | Medium | Tall (elastic) |
| Price of materials | Tall. | Medium | Low/Mediocre |
Liquid rubber (Plasti Dip): style and protection
Liquid rubber, often named after a popular brand name Plasti DipIt is a liquid polymer-bitumen coating. It is radically different from classical paints with its elasticity. After drying, a rubber-like film is formed, which is not afraid of stone strikes, since it simply cushions the impact.
One of the main features of liquid rubber is the reversibility of the process. If you are tired of the color or the coating is damaged, you can simply tear it off with a film, returning the disk to its original state. This makes the material ideal for experimenters who like to change the style of the car often or prepare the car for sale and want to hide the defects of the drives.
However, liquid rubber has serious limitations. She's afraid of high temperatures. When driving actively, the inner part of the disc may heat up more than the polymer can withstand, leading to melting or stickiness of the coating. Also. chemical resistance It's lower than acrylic: aggressive bitumen cleaners can dissolve the surface.
⚠️ Attention: When applying liquid rubber, it is critically important to observe the drying technology between the layers. If the next layer is applied too early, the coating may wrinkle or go bubbles when heated.
Liquid rubber is great for creating matte effects and complex colors (for example, a chameleon), but you should not count on a long service without updating in this case.
Can I paint with liquid rubber calipers?
Theoretically possible, but not recommended. The thermal resistance of ordinary liquid rubber is insufficient for calipers that heat up stronger than the discs. There are special heat-resistant modifications, but for calipers it is better to use specialized high-temperature enamel.
Technology of surface preparation before painting
Choosing paint is only half of the success. The remaining 50% depends on the quality of the surface. Even the most expensive ceramic It will detach if applied to dirty, fatty or oxidized metal. The preparation includes several mandatory stages.
The first step is always to thoroughly wash the disc using degreasing agents and brake dust removal products. Brake dust contains metal particles that, when in contact with water, cause corrosion even under the paint layer. After washing, it is necessary to mechanically remove the old coating, rust and chips.
For this purpose, a grinding machine with sandpaper of different grains is used. Start with a large grain (P80-P120) to remove the main layer and move to a small one (P240-P400) to create adhesion-producing rises. Phosphation Or the use of special rust converters will help stop corrosion at an early stage.
- 🧼 Careful washing and degreasing with white spirit or antisilicone.
- 🔨 Mechanical cleaning and grinding to pure metal.
- 🛡️ Applying acid or epoxy soil to protect aluminum.
- 💨 Drying and re-degreasing before painting.
Particular attention should be paid to the scorching. For cast discs, acid soils that chemically bind to aluminum are often recommended, creating a reliable protection against oxidation. Skipping the priming stage is the most common mistake leading to rapid peeling of paint.
☑️ Training checklist
The coating process and drying
The technique of applying paint directly affects the final result. When using aerosols or spray gun, it is important to observe the distance and speed of movement. The optimal distance from the nozzle to the surface is 20-30 cm. Movements should be smooth, reciprocal, with the exit beyond the edges of the painted part.
The paint must be applied in thin layers. Thick layer inevitably lead to leakage, long drying and the risk of wrinkling the surface. It is better to apply 3-4 thin layers with intermediate drying (interlayer exposure) than one greasy one. The drying time is usually 10-15 minutes, but it is better to focus on the manufacturer's instructions.
The final drying is a critical moment. Acrylic enamel dries "on the stick" in an hour, but full strength is gained after 24 hours or more. Complete polymerization It can last up to a week. During this period, it is better not to operate the disk, not to wash with chemicals and not to expose the load.
To speed up the process, you can use infrared drying or place the discs in a warm, well-ventilated room. However, artificial heating should be used carefully so as not to cause the solvent to boil inside the paint layer.
⚠️ Note: Do not try to accelerate drying with a household hair dryer at maximum power. Local overheating can create a "crust" on the surface under which the solvent will remain liquid, leading to defects in the future.
When painting with an aerosol, keep the canister warm (you can put it in a bucket of warm water 40-50 ° C). This will improve spraying, make the torch more uniform and reduce the risk of shaking.
Frequent errors in painting discs
Despite the apparent simplicity of the process, beginners often make mistakes that reduce the result to zero. One of the most common is poor degreasing. The remains of bitumen or polish create a fat film, because of which the paint lies in stains or falls off in pieces.
The second mistake is ignoring humidity and temperature. Painting in a cold garage or at high humidity leads to clouding of the varnish (the effect of "blush") and long drying. The moisture that gets into the paint layer will stay there forever, causing the metal under the coating to corrosion.
The third problem is the savings on materials. Buying the cheapest soil and paint of dubious origin often goes sideways. Cheap enamel may not have enough elasticity And crack at the first stroke or temperature drop.
It is also worth mentioning the error of insufficient protection of adjacent elements. If you paint the disc directly on the machine (which is not recommended, but possible), you need to carefully close the caliper, brake disc and tire paint tape and film. The hit of paint on the brake disc can cause creaking and uneven braking.
FAQ: Frequently Asked Questions
Can I paint the discs without removing the rubber?
Technically, this is possible, but it is highly undesirable. You will not be able to properly prepare the inner part of the disk and the ends, where corrosion most often begins. In addition, there is a high risk of paint staining the sidewall of the tire, which is then difficult to wash without damaging the rubber.
How much dried paint for discs?
The drying time depends on the type of paint and temperature. Aerosols dry to a stick in 30-60 minutes. Full polymerization (strength set) takes from 24 hours to 7 days. During this period, it is better to refrain from active driving and washing.
Do I need to remove the old paint completely?
If the old coating is held firmly, not swelled and does not have deep chips to metal, it can simply be wrapped (make matte) with grinding paper. If there is swelling or rust - you need to remove to metal.
Which paint will hide the scratches better?
Scratches best hide thick-layered coatings, such as liquid rubber or special filling soils. Glossy acrylic enamels, on the contrary, can emphasize irregularities if the surface was not perfectly aligned.