Local damage to the body is a problem that sooner or later every car owner faces. Small chips, scratches or burnt out areas of paint spoil the appearance, but contacting a specialized service often seems an unreasonably expensive solution for such trifles. In such situations, the technology of painting with aerosol cans comes to the rescue, allowing you to perform high-quality repairs in a garage or even an open area in good weather. This method requires precision and adherence to the technology, but it is available even for beginners.
The main secret of success lies not so much in the ability to hold a spray, as in the careful preparation of the surface. Many enthusiasts make the mistake of starting to apply paint immediately after washing, forgetting about deep cleaning, degreasing and the correct selection of shade. High-quality painting of cars with their own hands This is a process consisting of 80% of preparatory work and only 20% of the application of enamel. If you ignore the steps of grinding or priming, the result can be deplorable: the paint will soar, go bubbles or will differ in color in a week.
In this article, we will examine in detail the entire technological process, from the selection of materials to the finish polishing. You will learn how to mix components correctly, what temperature regimes to observe and how to avoid leaks. Aerosol painting It has its own nuances that distinguish it from working with a spray gun, and understanding these differences will be the key to the ideal result. Get ready for a hard work that is worth it.
Selection of materials and preparation of the workplace
The first step to successfully restoring paintwork is to purchase the right materials. The market offers a huge number of brands, but for independent work it is better to choose proven systems, such as: Motip, Body or Dupli-Color. It is important to understand that saving on the ground or varnish can negate all efforts, since it is these layers that provide the adhesion and durability of the coating. Cheap analogues often have a weak cover and quickly lose shine under the influence of ultraviolet light.
In addition to the paint itself, you will need a full range of related products. You can’t just buy a can of the right color and hope for the best result. You will need soil-epoxide or acid soil (depending on the type of damage), acrylic filler, base (if a two-component system is used) and varnish. For local repairs, ready-made repair kits are often used, but for more serious work, components are better to be purchased separately, selecting them for a specific case.
Buy all materials from the same manufacturer or make sure they are compatible, as chemical reactions between products of different brands can lead to detachment of the coating.
Pay special attention to the organization of the working space. Painting requires the absence of dust, drafts and direct sunlight. The ideal option is a paint camera, but at home a well-ventilated garage with off ventilation for the time of drying is suitable. The temperature in the room should be stable, in the range from +18 to +22 degrees Celsius, and the humidity should not exceed 60%.
Technology of body surface preparation
Surface preparation is the foundation on which all repairs are based. The process begins with a thorough washing of the part to remove dirt, bitumen stains and silicones. After drying, it is necessary to carry out defects and determine the boundaries of repair. If a small area is damaged, it makes no sense to remove the paint from the entire part, it is enough to treat the area around the damage with a margin of 10-15 centimeters.
Then comes the mechanical processing stage. Old paintwork and rust must be removed. For this purpose, sandpaper of various grains is used. Start with a rougher abrasive (P240-P320) to remove the bulk of defects, and then move to finer gradations (P400-P500) to create a smooth transition (stacking). The edges of the old coating should be negated so that the step is not felt with a finger.
⚠️ Note: When cleaning to the metal, be sure to use a rust converter or acid soil, otherwise corrosion will continue to develop under a new layer of paint, blowing it up from the inside.
After grinding, the surface must be degreased. Special antisilicons are used for this. You need to wipe with a clean napkin, constantly changing its side so as not to smear the fat on the surface. After degreasing, touching the prepared area with your hands is strictly prohibited, since skin fat will worsen soil adhesion.
☑️ Surface preparation stages
Footage and base-building
Soil application is a critical step that ensures the adhesion of the paint to the metal and protection against corrosion. Soil filler (acrylic) allows you to hide small risks from sandpaper and level the surface. It should be applied in 2-3 thin layers with interlayer drying, specified by the manufacturer on the can (usually 10-15 minutes). A thick layer of soil can leak or dry for a long time, which will spoil all the work.
After drying, the soil also requires grinding. If P500 paper was used in the previous step, the soil is grinded P600-P800 "dry" or P1000-P1200 "wet". The main goal is to get a perfectly smooth, matte surface without shaking. Any roughness of the soil will manifest itself on glossy paint, so this stage should be given maximum time.
The next step is to apply the base layer (if you use a base-varnish system) or directly enamel. The base layer gives color, but has no shine and no protection. It should be applied carefully, holding the canister at a distance of 20-25 cm from the surface. Movements should be smooth, reciprocal, with exit beyond the edges of the painted area.
The Secret to the Perfect Base
The first layer of the base is applied very thinly, almost transparently (the so-called "fog layer"). This is for primary adhesion. The second and third layers are already laid more tightly, covering the ground, but not allowing leaks.
Paint and lacquer application technique
The process of painting itself requires a certain skill. The balloon should be kept strictly perpendicular to the surface. If you tilt it, the torch spray will change, and the paint will lie unevenly, stripes and divorces are possible. The speed of movement of the hand should be uniform: too slow conduct will lead to leaks, too fast - to "shooting" and dry spraying.
The optimal application technique involves overlapping the previous passage by 50%. This ensures a uniform density of the layer. Paint from the spray before starting work must be carefully shaken (2-3 minutes) to mix the ball and components. During the work also periodically shake the balloon to keep the consistency uniform.
After drying the colored layer (usually 20-30 minutes) is applied varnish. Lacquer creates a protective film and glossy shine. It is also applied in 2-3 layers. The first layer is thin, the second is wet, but within reasonable limits to avoid undercurrents. Lacquer is the final decorative and protective barrier.
⚠️ Warning: Do not try to speed drying with a hair dryer or fan heater – harsh heating can boil the solvent inside the layer, creating craters or bubbles on the surface of the varnish.
The key to success when working with a spray can is a constant speed of movement of the hand and a fixed distance to the surface (20-25 cm).
Table of compatibility and drying time
For a qualitative result, it is important to observe the time intervals between stages. Violation of drying technology is the most common cause of defects. Below is an indicative table, but always check the instructions on a specific can, as the chemical composition of different brands may differ.
| Materials | Number of layers | Drying between layers | Complete polymerization |
|---|---|---|---|
| Acrylic ground | 2-3 | 15-20 minutes | 24 hours. |
| Basic enamel | 2-3 | 10-15 minutes | 1-2 hours |
| Lacquer | 2-3 | 15-20 minutes | 24-48 hours |
| Polishing | - | - | In 7-14 days. |
Note that complete polymerization (final solidification) takes much longer than the time per stick. Until final drying, the part cannot be washed with aggressive chemistry or subjected to mechanical loads. The polish remains soft in the depths for a long time.
Removal of defects and finishing polishing
Even experienced craftsmen after painting may have small defects: dust, shashashare ("orange peel") or small stains. Don’t panic if you notice them after drying the varnish. Most of them are eliminated by polishing, but you can start it only after complete crystallization of the varnish, it is desirable to wait at least a week.
The polishing process begins with abrasive processing. Used polishing circles and pastes of different grains. First, a hard paste (e.g., 3M Fast Cut) is applied to remove the shaking and level the surface. Movements with the polishing machine should be smooth, without strong pressure, so as not to wipe the varnish to the base.
Then follows the stage of finish polishing with soft paste to give a deep gloss and remove holograms. After polishing, the surface is treated with protective wax or ceramics. This will not only improve the look, but also make it easier to care for the car in the future, pushing away dirt and water.
What do you do with the high-temperature stain?
If the varnish is too thin, do not try to polish it right away. Let it dry for a few days, then gently cut the upper part of the bumper with a sharp blade without touching the edges, and only then grind and polish the transition zone.
Frequently Asked Questions (FAQ)
Can I paint the whole car with a spray?
Theoretically, it is possible, but in practice it is extremely difficult to do qualitatively. Painting the whole body requires a huge amount of cans, ideal conditions and professional skills to avoid transitions and diversity. For large volumes, it is better to use a spray gun.
How many cans do you need to paint a bumper?
A standard bumper usually requires 2-3 cans of base (enamel) and 2 cans of varnish. The flow rate depends on the color (red or yellow may require more layers for cover) and the size of the part.
Do I need to remove the part from the car?
It is advisable to remove details (doors, wings, bumpers) for painting. This allows you to process the ends and avoid getting paint on neighboring elements. However, local repairs often paint on site, carefully covering the surrounding surfaces with paint tape and film.
Why did the shaking on the varnish appear?
Shagrens ("orange peel") most often occurs due to improper viscosity of the paint, too long distance to the surface, high temperature in the room or insufficient drying time between the layers. It's being polished.
How to choose the exact color of paint?
The color code is usually on a sign in the doorway or under the hood. By this code, you can order a corrugated canister in a specialized store. However, remember that the paint on the car fades over time, so even a precise hit in the code can give a slight shade difference.