The appearance of scuffs on paint is an inevitable reality of operating any vehicle, no matter how careful you are with your car. motorcar. Even with careful parking and the absence of an accident, small branches, gravel or careless touching with a bag can leave an unpleasant mark on the body, which immediately catches the eye. Many owners mistakenly believe that to eliminate such defects will necessarily require expensive repainting of the part in the service center, but in most cases, the situation can be corrected independently.
Modern technologies and availability of professional autochemistry allow high-quality shine back And the smoothness of the surface in garage conditions, if you approach the process with an understanding of the physics of the process. It is important only to correctly assess the depth of damage: if the nail does not cling to the scratch, then only the upper layer of varnish is damaged, and polishing will give an excellent result. In this article, we will discuss all the nuances of preparation, choice of tools and direct technology for removing scuffs so that you can return the car to a neat appearance without unnecessary costs.
Diagnosis of the depth of damage to the paint coating
Before grabbing a polishing machine or abrasive paste, it is necessary to clearly determine how deep the damage has penetrated into the coating structure. The body of the car is covered with a multi-layered “cake” consisting of a phosphate layer, soil, base (color) and finishing varnish, and the repair method depends on the integrity of each layer. If you have held your nail across the scratch and felt a distinct step, and the bottom of the groove has a metal color or black soil color, then conventional polishing here will not help - local painting is required.
In the case when the damage looks like a whitish or matte strip, but the tactile surface remains smooth, we are talking about the scuffing of the upper layer of varnish. These are the defects called microscrapThey are effectively removed by abrasive polishing, which removes the micron layer of varnish, leveling the surface to the level of the bottom of the scratch. A faulty definition of depth can lead to the fact that you simply and wipe the varnish to the base, which will require a much more complex and expensive recovery.
⚠️ Attention: Never try to polish the scratch to the metal with abrasives – this will lead to irreversible damage to the base and rapid corrosion under the coating.
For more accurate diagnosis in complex cases, professionals use special markers or liquids that temporarily fill the scratch, making its real bottom visible. If after washing and degreasing the defect is still noticeable, but not felt with a finger, then you have every chance to cope with it by methods. polishing. The main rule: the deeper the scratch, the more rough abrasive will be required at the initial stage, but the more careful you need to act so as not to remove excess varnish.
Required tools and materials for the job
The quality of the result depends on what you will work for, and the use of household chemicals or toothpaste is not recommended here. For a professional approach, you will need a specialized auto cosmetics that has a strictly calibrated size of abrasive particles. The basic set should include a polishing machine (preferably orbital with an eccentric course of 8-15 mm), a set of circles of different rigidities and a line of polishing pastes from rough to finish.
Particular attention should be paid to the choice of polishing circles, since they transmit the force and abrasive to the surface of the body. Fur circles are divided by color: yellow and white are designed for finishing and applying protective compounds, and orange or black are used for the primary removal of the layer of varnish and the removal of serious scuffs. It is also important to prepare paint tape, high-quality microfiber, degreasing (for example, scotch). antisilicone) and clay for cleaning the body before work begins.
Don’t skimp on microfiber, as cheap fabrics can themselves become a source of new scratches during the finishing wipe. It is better to use specialized towels with a high pile and a density of at least 400-500 g / m2, which are guaranteed not to leave villi and stains. Also, do not forget about personal protective equipment: respirator and glasses, as polishing creates fine dust, which is harmful to the airways and eyes.
Preparation of the body for the polishing procedure
Quality surface preparation is 70% of the success of the entire operation, and skipping this stage will negate all further efforts. First of all, the car must be thoroughly washed in a two-phase way, removing the main dirt, bitumen stains and road dust, which can turn into an abrasive when working with a machine. After washing, the body should be treated with cleansing clay to pull out of the pores of the varnish the ingrained metal particles and resins that are not washed away with shampoo.
After drying the body, be sure to degrease the surface with a special composition or isopropyl alcohol diluted with water in a ratio of 1:10. This will remove the residues of waxes, polyroles and silicones, which can interfere with the work of the abrasive and create uneven surface heating. All plastic elements, rubber seals and chrome parts around the polishing area should be glued with paint tape, as the paste can stain black plastic or get stuck in the rubber pores.
☑️ Checklist for polishing preparation
Work should be in a well-lit room, preferably with bright side light, which allows you to see all defects in the dynamics. The temperature in the box should be in the range of +15 to +25 degrees Celsius, since in the cold the paint coating becomes too hard and can crack, and in the heat the paste will dry too quickly. Properly prepared place and clean body - the guarantee that you do not rub dust in the varnish and get a mirror result.
Technology for removing scabs by abrasive method
The polishing process begins with applying a small amount of abrasive paste to the circle or directly to the body, after which the machine is turned on at low revs to distribute the composition. Do not press the tool strongly to the surface - the weight of the machine itself and light pressure of the palm is enough for effective work; excessive effort will lead to overheating of the varnish and the appearance of "holograms". Movements should be cross, slow and smooth, with the previous passage overlapping by about 50-70%.
It is important to constantly monitor the surface temperature with the back of the palm: if the varnish becomes hot, you must immediately stop and let it cool, otherwise you can “break through” the coating or cause it to become cloudy. To remove deep scuffs, a paste with a large abrasive (often labeled as Heavy Cut or Compound) is used, which removes the main layer of the defect, but leaves a matte behind. Then there is the transition to a smaller abrasive (Polish), which removes the risks from the first paste and returns transparency to the varnish.
Secrets of working with an orbital machine
When working with an orbiter, it is important not to stop the rotation of the circle in one place when the engine is on, as this can lead to local overheating. It is also recommended to periodically clean the circle of old paste with a special brush or purge to restore its abrasive properties.
The final stage involves the use of a soft circle and paste with a minimum content of abrasive or completely abrasive compositions to create gloss. It is at this stage that the final quality of work is manifested, and if you see residual risks or holograms, the procedure with a thin paste should be repeated. Remember that polishing reduces the thickness of the varnish, so you should not abuse frequent polishing - the life of the paint coating is not infinite.
Comparative characteristics of polishing pastes
Choosing the right paste is critically important, since using too aggressive a soft varnish composition can lead to disastrous results, and a weak composition will not remove defects. There are many brands on the market today, such as Menzerna, Rupes, Koch Chemie and Farecla, each of which has its own gradation in cutting ability and polishing effect. Understanding the labeling and purpose of products helps to save time and avoid errors in the process.
Below is a table that will help you navigate the types of pastes and their application for various stages of body restoration. Note that many manufacturers use color coding to indicate the degree of abrasiveness, which makes it easier to choose in-store.
| Type of pasta | Degree of abrasiveness | Principal appointment | Recommended circle |
|---|---|---|---|
| Rough (Heavy Cut) | Tall. | Removal of deep scratches, shashashares | Hard foam, wool. |
| Medium (Medium Cut) | Medium | Removing holograms, working after rough | Medium stiffness (orange) |
| Finish (Fine Cut) | Low. | Giving gloss, removing micro-risks | Soft foam (white/blue) |
| Anti-hologram | Micro-abrasive | Final elimination of divorce | Soft finishing |
When working with new, modern varnishes, which are often quite hard, a more aggressive paste or longer contact with the surface may be required. At the same time, old or soft Japanese varnishes require maximum caution and the use of gentle compounds, so as not to remove the coating to the base. Always test the selected bundle of "pasta-circle" on an inconspicuous part of the body to make sure the correct selection of materials.
Protection of the body after polishing and care
After the scuffs are eliminated and the body shines, it is extremely important to consolidate the result and protect the updated layer of varnish from external influences, as it has become thinner and more vulnerable. The ideal solution would be to apply a ceramic coating, liquid glass or high-quality synthetic wax, which will create an additional hydrophobic layer. Such compositions not only enhance the shine, but also facilitate subsequent washing, preventing the sticking of dirt and reagents.
Apply a protective coating (wax or ceramics) immediately after polishing, until the pores of the varnish are open and cleaned as much as possible - this will ensure better adhesion and durability of protection.
In the first few weeks after polishing, it is not recommended to wash the car with aggressive chemicals or on automatic washes with hard brushes. Allow the protective layer to be fully polymerized and the new lacquer condition to adapt to the environment. Regular use of contactless sinks and maintaining the cleanliness of the body will prolong the life of polishing and keep the neat appearance of the car for a long time.
⚠️ Attention: Do not apply protective compounds on underdried or insufficiently defatted after polishing the body - this will lead to the appearance of stains and uneven distribution of protection.
Remember that polishing is not a panacea for all troubles, but a cosmetic procedure that requires periodic updating. With proper care and timely treatment with protective compositions, the intervals between polishing can be significantly increased, keeping the body in the state of a “new” car for many years of operation.
Polishing removes a micron layer of varnish, so you should not carry out this procedure more than once a year without extreme necessity, it is better to limit yourself to protective coatings.
Frequently Asked Questions (FAQ)
Can I remove the rubbing of a regular toothpaste?
Theoretically, toothpaste contains fine abrasives, but it is not designed for automotive lacquer. The effect will be short-term and weak, and washing away the paste from hard-to-reach places will be difficult. It is better to use specialized tools, such as scratch-off or a reconstituting polymer that guarantees results without risk of damage.
How many times can you polish the body of the car?
The number of polishes is limited by the thickness of the paint coating. On average, for the entire life of the car, you can conduct 3-5 full-fledged abrasive polishing before there is a risk of rubbing the varnish to paint. It is recommended to measure the thickness of the varnish with a thickness gauge before each procedure.
What is the difference between an orbital and rotary polishing machine?
The rotary machine rotates a circle only around its axis, which gives high performance, but a high risk of overheating and holograms. Orbital (eccentric) combines rotation and vibration, which makes it safer for beginners and eliminates the appearance of circular divorces.
Do I need to polish the entire car if the scratch is only on the door?
No, polish the entire body is not necessary, if the difference in shine will not be noticeable. However, when polishing one part, it is important to properly rub the boundary of the transition (stretching) so that there is no clear boundary between the polished and old surface.