The appearance of red dots on the body of the car is always an unpleasant surprise that can catch even an experienced owner by surprise. This process cannot be ignored because corrosion It has the property of quickly spreading under paint coating, turning into through holes. Many car owners immediately imagine an expensive visit to the service center and a complete repainting of the part, but this is not the only way out.
Modern materials allow you to effectively deal with foci of rust on your own, using a conventional aerosol can. This method is called spot repair (point repair) and with proper execution gives a result that is visually almost indistinguishable from the factory coating. The main thing here is not to save on surface preparation and strictly observe the technology of layering.
In this article, we will discuss in detail how to properly paint the damaged area, what tools you will need and how to avoid typical mistakes. You will learn how to choose the right shade of paint and protect the metal from re-emergence of corrosion. The key to a successful repair is not the painting itself, but the thorough stripping of the metal to shine before applying the primer.
Diagnosis of damage and choice of materials
Before running to the store for cans, it is necessary to objectively assess the scale of the disaster. Surface rust, which only slightly touched the upper layer, and deep foci, extending into the depth of the metal, require different approaches. If when pressing a finger, the metal bends or crumbles, then we are talking about through corrosion, requiring cutting out part of the part and welding the patch, which already goes beyond simple coloring.
For local repairs, you will need to collect a certain set of materials. Do not buy the first paint you find in the nearest supermarket, as its quality can be low. Look for specialized car enamels that have resistance to ultraviolet light and temperature changes.
- 🛠️ Rust converter chemical composition that stops oxidation.
- 🎨 Aerosol paint It is exactly the color of your car by code.
- ✨ Acrylic lacquer - to create a protective glossy layer and protect the pigment.
- 🧽 Degreaser - antisilicone for removing fat spots before painting.
⚠️ Warning: Never apply paint over loose rust without pre-treatment with a converter or mechanical cleaning. This only preserves moisture under the paint layer, and in a couple of months the swelling will begin again, but with greater force.
The selection of color is a critical stage. The paint code is usually on a plate in the doorway, under the hood or in the trunk. However, even factory paint fades over time, so the ideal option is a computer-based selection of enamel in a specialty store, where the colorist will take into account the age of your car.
Preparation of the workplace and tools
The quality of the final result depends on the conditions in which you will work. Dust flying from the ceiling of the garage, or gusts of wind on the street can irrevocably spoil the fresh paint, leaving it splashes of debris. The ideal place is a professional paint camera, but at home a clean, well-ventilated garage or a canopy in the yard in windless weather will suit.
The temperature of the environment also plays an important role. The optimal range for working with aerosols is from +18 to +22 degrees Celsius. At lower temperatures, the paint can lie matte shavern or dry for a long time, and in the heat - boil, forming craters. The humidity of the air should not exceed 60%, otherwise the effect of "whitening" of the varnish may appear.
In addition to the conditions, tools must be prepared. You will need sandpaper of different grains (from P80 to P2000), grinding bar, paint scotch, degreaser and lilaless wipes. Also, don’t forget about personal protective equipment: a respirator with a carbon filter and gloves, as solvent vapors are toxic.
Technology of cleaning and surface preparation
The most time-consuming step is to remove rust. Your job is to get to a clean, healthy metal. You need to start with mechanical cleaning of the damaged area. Use P80 or P120 sandpaper, gradually expanding the machining area to create a smooth transition (cutting) between the paint and metal.
Don’t just try to clean the red from above. Rust has the property of penetrating deep into the pores of the metal. If there are black dots left after cleaning, the corrosion process will continue. In such cases, it is advisable to use a rust converter that will turn iron oxides into stable compounds.
☑️ Checklist for surface preparation
Once the metal is cleaned, the correct transition must be made. The edges of the factory paint should be smoothed so that the new layer lay flat and the border of repair was minimally noticeable. To do this, use the abrasive P500 or P600, gently passing along the perimeter of the cleaned spot.
The transition grinding sequence:1. P80 - removal of rust.
2. P240 is the primary alignment.
3. P500 - Creating a smooth transition (stewing).
4. Degreasing.
The final touch of preparation is thorough degreasing. Wipe the surface with a napkin moistened with antisilicone, moving from the edges to the center. Do not rub back and forth so as not to smear the fat on pure metal. Allow the solvent to evaporate completely before the next step.
Printing and base application
The ground is the foundation of your repair. It provides adhesion (adhesion) of the paint with the metal and protects it from corrosion. For aerosol repair, two-component acrylic soil in a can with an activator in the lid is best suited. Before use, activate the composition by pressing the activator button, and carefully shake the balloon for 2-3 minutes.
Apply the soil in thin layers, withstanding interlayer drying (usually 10-15 minutes). Your goal is to completely cover the metal and create a smooth matte surface. Do not try to fill everything with one thick layer at once, otherwise the soil may leak or dry for a long time inside.
| Parameter | grunt | Basic paint. | lacque |
|---|---|---|---|
| Distance to detail | 20-25 cm | 25-30 cm | 25-30 cm |
| Drying time between layers | 15 minutes | 10-15 minutes | 20-30 minutes |
| Number of layers | 2-3 layers | 2-3 layers | 2-3 layers |
After drying the soil (usually after 30-60 minutes), it must be sanded with the abrasive P800-P1000 "dry" or P1200 "wet" to remove the shafts and dust. The surface should be perfectly smooth to the touch. Then degrease the surface again.
Do I need to grind the soil before paint?
Yes, ground grinding is mandatory. It removes dust from drying and creates micro-scratches for better grip on the base. If the soil is not grinded, the paint can lie with defects or peel off over time.
Now you can start applying the base paint (metallic or solid). The cylinder should be kept perpendicular to the surface at a distance of 25-30 cm. Movements should be fast and uniform. The first layer is applied very thinly, almost transparently (the so-called "supple"), so that the base better adheres to the ground.
Finishing and polishing
After applying 2-3 layers of the base and drying them (usually 20-30 minutes), it is time to varnish. Lacquer protects the paint from burnout and mechanical effects. The application technology is similar: 2-3 thin layers with interlayer drying. Try to varnish the surrounding factory paint a little to smooth the transition.
Full polymerization of the lacquer takes from 24 hours to several weeks. Immediately after painting, the transition can be noticeable due to the difference in the shavern (surface structure). Factory paint has a certain texture, and new, applied locally, can be smoother or, conversely, more rough.
To make the transition less noticeable, you can carefully polish the boundaries of the transition 2-3 weeks after painting, when the varnish finally hardens. Use a polished paste of medium abrasiveness.
Abrasive polishing is used to eliminate visible boundaries and give shine. You can start polishing no earlier than in a day, but it is better to wait a couple of days. Use a soft-circle polishing machine and finishing paste. Movements should be smooth, without strong pressure, so as not to wipe fresh varnish.
Common Mistakes and How to Avoid Them
Even following the instructions, beginners often make mistakes that reduce the result to zero. One of the most common is the application of paint on a cold body. The metal has the property of condensing moisture from the air, and if the car just drove in from the cold or just cold, a microfilm of water is formed under the paint, which will lead to peeling.
Another mistake is the lack of swelling of the can. The pigment and varnish in the aerosol tend to be layered. If you do not shake the balloon for 2-3 minutes before each use, you can apply a transparent solvent to the body, and the pigment will remain inside.
⚠️ Note: Do not use quick-drying solvents (646, 647) to degrease certain plastics or old enamels. They can cause a swelling of the surrounding coating. Use only the car anti-silicone.
There is also a frequent error in choosing the spraying distance. If you hold the balloon too close, it creates leaks. If too far - the paint does not reach the surface in the form of fog, lies dry and rough. Compliance with the distance of 25-30 cm - the pledge of a flat layer.
The main secret of invisibility (invisibility) repair is a high-quality shining of the edges of the old coating before painting and the correct application of varnish with the capture of the transition zone.
Remember that the perfect result the first time is rarely obtained. Local spray repair is a skill that comes with practice. If you’re afraid of ruining a prominent detail, try first to work out on an old door or a piece of metal in the garage.
FAQ: Frequently Asked Questions
Can I paint a car with a spray without removing the part?
Yes, local paint (spot repair) is carried out directly on the car. The main thing is to carefully glue paint tape and paper all neighboring elements, glass and rubber seals, so that paint and varnish do not get pollinated.
How much dried paint from the spray?
The drying time "on the stick" (when the dust is no longer sticky) is 20-30 minutes at a temperature of +20 ° C. However, full polymerization, when the coating is gaining maximum strength, takes 14 to 30 days. During this period, it is better not to wash the car with aggressive chemicals and not to polish.
Do I need soil if I've cleaned the rust to metal?
I will. The metal cannot be left open, even for a short time, as it immediately begins to oxidize. The soil creates a chemical bond with the metal and a mechanical bond with the paint. Without soil, paint will not last long.
What is the difference between metallic paint and solids?
Paint. metallic contains aluminum powder, which gives a transfused effect, but necessarily requires coating with varnish. Solid (common enamel) does not contain metal particles, often has its own luster and can be operated without varnish, although varnishing is still recommended for durability.
What to do if you have sweat?
If the flow formed on a liquid layer, it can be carefully removed by holding a stream of air from the balloon (to knock down). If the paint is already dried, you need to wait for full polymerization (a few days), then gently grind the sweat with abrasive P2000 and polish this place.