Every car owner at least once faced with an unpleasant situation when on the glossy surface of the body suddenly appeared damage. I got the varnish on the car. This is not just a cosmetic defect that spoils the appearance, but also the first step to serious problems with metal. Many drivers ignore small scratches or detachment of the coating, believing that this does not require urgent intervention, however, moisture and reagents penetrate the paint layer instantly.
Painting restoration (LCP) is a process that can be performed independently if you act competently and use the right materials. In this article, we will take a detailed look at why the lacquer detachment occurs, what tools will be needed for local repairs, and how to avoid common mistakes that may lead to the need for a complete repainting of the part. Complete removal of the varnish to metal on a large area requires professional equipment and paint chamber conditions.
Timely response to damage can save significant money. Instead of expensive repainting of the item in the service, you can limit yourself to polishing or local paint. It is important to understand the nature of the damage: is it a deep scratch, a chemical burn or the result of a stone impact? The choice of the restoration method depends on this.
Causes of lacquer detachment and diagnosis of damage
Before you start to correct the defect, you need to understand why. varnish. Most often, the cause is a violation of the coating technology at the plant or during previous repairs. If the base layer of paint or soil was applied to a dirty surface or with a violation of the temperature regime, the adhesion (clutch) of the layers weakens over time.
External factors also play a huge role. Road reagents containing salts, aggressive chemistry on automatic washes and prolonged exposure to ultraviolet light destroy polymer bonds in the varnish. Acrylic varnishes They are more stable, but they are not eternal. Often, the damage begins with a microscopic chip where water gets into. Freezing and expanding in winter, it raises the edges of the varnish, forming a characteristic “bubble”.
⚠️ Note: If you notice a bloating varnish, do not just try to wipe the place with polish. The pressure of the polishing circle can finally tear off the damaged area, increasing the area of the defect.
Diagnosis must be thorough. Swipe your finger in the glove over the surface. If the edge of the damage is felt clearly and dirt falls under the nail, then the violation of integrity is profound. In the case when the polish simply faded or has a slight roughness, the situation is rectified by gentle methods. Deep chips to metal require immediate insulation from moisture.
Required materials and tools for restoration
A qualitative result is impossible without the correct selection of consumables. You will not only need to work on your own. car-lacquerand also auxiliary means for surface preparation. The basic set includes a degreasing agent (antisilicone), polished paste of different abrasiveness and microfiber. It is important to use materials that are compatible with the type of coverage you have.
If you need paint, you need to precisely choose the paint code. It is usually indicated on a plate in the hood space or on the body rack. For local repair of chips, special restoration pencils or vials with a brush are often used. More serious damage will be required. two-piecewhich is mixed with the hardener immediately before application.
- 🛠️ Abrasive materials: sandpaper gradations P2000, P2500 and P3000 for wet grinding.
- 🧴 Chemistry: degreasing, polishing pastes (abrasive and finishing), wax preservative.
- 🖌️ Tool: polishing machine (or drill with nozzle), applicators, brushes for spot painting.
- 🧤 Consumers: paint scotch, microfiber wipes, gloves, respirator.
Do not skimp on solvents and degreasing agents. Cheap analogues can leave a greasy film or react with the varnish, causing its clouding ("boiling"). Use only specialized automotive chemicals designed to work with LCPs.
Always test for material compatibility on an unobtrusive area or an old part before applying a new varnish to the body of the car.
Surface Preparation: A Key Stage of Success
Preparation takes up to 70% of the time of the work. If varnishThere is often a stress zone around the damage. The first thing the car needs to be thoroughly washed and dried. The defect site and the area around it are then defatted. This is a critical point: any residue of silicone, wax or bitumen will cause the new material to not lie flat.
Then comes the grinding process. The edges of the detached varnish should be carefully sanded to make the transition from the whole coating to damage as smooth as possible. High-numbered abrasives (P2000 and above) are used with water. Grind carefully, trying not to touch the base layer of paint, if it is intact. The goal is to create a shelf for new material.
☑️ Checklist for body preparation
After grinding, the surface is again wiped with a degreasing agent. Do not touch the prepared place with your hands, as the skin fat will worsen adhesion. If the damage has reached the metal, it must be primed. For small chips, it is convenient to use the soil in the form of a pencil or brush. The soil should dry completely, according to the instructions on the package, usually it takes from 30 minutes to several hours.
⚠️ Warning: Never apply varnish or paint to moist ground or an underdried degreaser. This will result in the formation of bubbles and craters on the surface.
Technology of applying varnish and paint
The application process depends on the extent of the damage. For small chips, the point painting method is used. The paint is applied in thin layers with a thin brush or needle, filling the recess. Each layer should dry for 10-15 minutes. After the restoration of color is applied car-lacquer. Its task is to level the surface and protect the paint.
If the area of damage is large, local painting with a stub may be required. In this case, the paint is applied with an airbrush or mini-beauty. Lacquer is also applied in 2-3 thin layers. The first is the sleeve, and the next is the sleeve. It is important not to pour the material, otherwise leaks are formed that will have to be eliminated for a long time.
| Type of damage | Repair method | Materials required | Drying time |
|---|---|---|---|
| Small chip (up to 2 mm) | Spot paint | Paint pencil, pencil polish | 2-4 hours |
| Scratching to the ground | Local polishing + lacquer | P2500 abrasive, polyrene, lacquer | 12:24 hours. |
| Flavoring | Cleaning, soil, paint, varnish | Soil, enamel, 2K varnish, solvent | 24-48 hours |
| Deep scratch to metal | Complete restoration | Anticor, soil, base, lacquer | 72 hours |
When working with two-component varnishes, remember that after mixing with a hardener, you have limited time to work (mixture viability). It's usually 30-60 minutes. Prepare as much mixture as you can spend. The excess material in the container will quickly harden and become unusable.
Nuances of work with two-component lacquer
The two-component (2K) lacquer is significantly stronger than the single-component (1K) lacquer that comes in pencils. It is resistant to chemistry and scratches, but requires a precise dosage of hardener. If you add a little hardener - the varnish will remain sticky, if a lot - will become brittle and may crack. It should be used in a well-ventilated room and in a respirator, as isocyanate vapors are toxic.
Finishing polishing and coating protection
After car-lacquer applied and completely dried, the surface may have irregularities ("swinging") or a matte shade. Finishing is done to eliminate these defects. This stage returns the factory gloss to the coating and aligns the transitions between the old and new lacquer.
The polishing is carried out in several stages. First, an abrasive paste is used to remove micro-nervities. The movements of the polishing machine should be smooth, without strong pressure, so as not to overheat the varnish. Then a finishing paste is applied to remove holograms and give depth to the color. Completes the process of applying protective wax or ceramic coating.
- 🌡️ Temperature control: Do not polish in direct sun or hot body. The lacquer can become too soft and “swim” under the circle.
- 💧 Moisturizing: When working with abrasive pastes, the surface should be slightly moistened if paste technology requires it.
- 🧼 Cleanliness: Use only clean polishing circles. The dirty circle will leave deep scratches.
The protective layer is not just a gloss. Modern synthetic waxes and ceramic compounds create a hydrophobic film that repels water and dirt, facilitating subsequent washing. This is especially important for freshly renovated areas where polymerization of the varnish can last up to several weeks.
High-quality polishing hides the traces of repair and makes the transition between new and old varnish visually imperceptible, prolonging the recovery life.
Frequent Mistakes and How to Avoid Them
Beginners often make mistakes that negate all efforts. One of the most common is the application of thick layers of varnish in the hope of quickly closing the defect. This leads to leakage and long drying. Lacquer should be applied thinly, "spraying" it. It is better to make three thin layers than one fat.
Another mistake is ignoring the temperature. If the garage is too cold (below +15 ° C), the varnish may not get up properly, cloudy or dry at all. Too high a temperature will accelerate drying, and the material will not have time to spread, leaving a rough shaking. The optimal temperature for work is +20 ... +22 ° C.
⚠️ Attention: Attempt to polish the undried varnish will lead to the fact that it will “tend” behind the circle and turn into a tractive mass. Always check the hardness of the coating on an inconspicuous area.
It is also worth mentioning the use of inappropriate solvents. An aggressive solvent can “lift” old paint or make the varnish matte. Use only those solvents that are recommended by the varnish manufacturer. If you are not confident in your abilities, it is better to train on an old part or turn to professionals, as reworking is always more expensive.
FAQ: Frequently Asked Questions
How much does the varnish dry on the car at a temperature of +20 ° C?
The drying time depends on the type of varnish. One-component varnish (in pencils) dries to a stick in 30-60 minutes, but full hardness gains in 24 hours. Two-component professional varnish dries faster - 15-30 minutes before the lip, but it is recommended to polish it no earlier than 12-24 hours to guarantee the result.
Can I paint the chip without stripping to metal?
If the chip is left factory soil, you can apply paint directly on it, pre-degreased surface. If you see bare metal, it must be protected with anticort or soil, otherwise under the layer of paint will begin corrosion, and after a while the paint will rise again.
Why did the new varnish become cloudy after application?
Cloudiness (white coating) most often occurs due to high humidity in the room, draft or the use of a poor-quality, fast solvent in cold weather. The moisture condenses into the lacquer layer. Light clouding can sometimes be removed by polishing, but in serious cases the layer will have to be removed and applied again.
Do I need to remove all the varnish from the part if it climbed in one place?
Not always. If the detachment is local and the varnish is held tightly around, you can make repairs with transitions. However, if the varnish began to "climb" throughout the detail or there are multiple foci of detachment (often on the roof or hood of old cars), then you will need a complete removal of the old varnish and repainting of the element.