The process involves the use of special equipment capable of supplying paint components (base and hardener) separately, combining them only in the static mixer of the gun. This feature allows you to work with materials that have a very short lifetime after mixing, which is impossible with the classical approach. Owners cars choose this option to quickly repair chips, scratches or abrasions when a full repair with kiln drying is impossible or economically infeasible.
The technology has its own strict limitations and requires highly qualified performers, since errors in proportions or application speed lead to visible defects. Unlike factory painting, spray painting is often seen as a compromise solution between cosmetic repairs and full restoration. Understanding the physical processes that occur when mixing components on the fly helps the car owner evaluate the quality of the work performed and the durability of the result.
The essence of the technology and the principle of operation of the equipment
The method is based on the use two-component materials, which are not mixed in advance. The spray gun is equipped with a double feed system and a static mixer installed at the end of the spray. This device ensures that the chemical polymerization reaction will begin only after the drops leave the nozzle, which prevents the paint from drying inside the tool channel.
This approach allows the application of materials with high viscosity without adding large amounts of solvent. The result is a layer with a high dry residue, which theoretically should give good hiding power. However, uniform application depends on pressure stability and calibration accuracy. mixing nozzles.
Many craftsmen note that the work requires constant movement of the hand, since stopping even for a split second leads to the formation of a build-up that cannot be removed by polishing due to the instant setting of the composition. Spray gun equipment is more difficult to maintain than standard spray guns and requires thorough cleaning with solvent immediately after completion of the operation.
How does a static mixer work?
A static mixer is a tube with helical partitions inside. Passing through them, the two components of the paint are repeatedly divided and mixed, ensuring the homogeneity of the composition even before it reaches the metal surface.
Advantages and disadvantages of the method
The main argument in favor is the speed of work completion. Since there is no need to wait for the primers to dry or polish transitions in large areas, the machine can be delivered to the client on the day of the call. This makes the method popular for pre-sale preparation or quickly eliminating the consequences of minor accidents.
- 🚀 High speed of local repairs without long drying.
- 💰 Relatively low cost compared to completely repainting the element.
- 🎨 Possibility of precise color selection by mixing pigments in real time.
- 🛠 Minimal surface preparation; often it is enough to simply degrease the area.
However, the technology also has serious disadvantages. The service life of such a coating is often inferior to classical painting, especially when used in aggressive environments. Adhesion (adhesion) of the material to the body may be weaker if the surface has not been perfectly prepared, and the absence of a full layer of varnish makes the coating matte and less resistant to chemicals.
⚠️ Attention: Syringing is not recommended for large areas, as there is a high risk of streaking and uneven tone (“apple-apple”) over the entire surface.
Scope of application: when you really need it
Most often, owners of commercial vehicles or cars preparing for sale resort to injection. When on the bumper passenger car a network of small scratches appears, a full-fledged painting may cost more than is appropriate for this car. In such cases, technology allows you to quickly refresh the appearance of the part.
The method is also in demand when working with hard-to-reach places where it is difficult to reach with a standard torch, or, if necessary, painting the internal cavities of thresholds and arches with special anti-corrosion compounds that require mixing components. In car repair shops this is often called “anti-corrosion” or local restoration.
You shouldn't expect a miracle if rust has already eaten the metal from the inside. Syringing is a cosmetic, not a structural repair. If the geometry of the body is broken or there is through corrosion, welding and straightening will be required, after which you will still have to paint the element using classical technology.
Technological process of coating
The process begins with thorough washing and degreasing of the surface. Unlike full painting, abrasive treatment of the entire part is rarely used, limiting itself to cleaning defective areas. This saves time, but reduces the reliability of paint adhesion to metal at the transition boundaries.
The wizard sets up spray gun, regulating the supply of components and air pressure. The most important step is a test spray on paper to check the pattern and color uniformity. Only after making sure that the settings are correct, the specialist begins to apply the material to the body with short, confident movements.
☑️ Stages of preparation for syringing
After applying the first layer, a pause is often required for the evaporation of volatile fractions, although it is much shorter than when working with conventional enamels. The finishing layer is applied taking into account the requirements of the specific material, after which the car can be ready for use almost immediately, since polymerization occurs very quickly.
Comparison with traditional painting and polishing
To understand the difference, you need to consider quality and durability parameters. Traditional painting in a booth using car enamels and varnish provides a glossy shine and protection comparable to factory. Spraying gives a matte or semi-matte surface, which is difficult to polish to perfection.
| Parameter | Syringing | Traditional painting | Polishing |
|---|---|---|---|
| Lead time | 30-60 minutes | 1-3 days | 2-4 hours |
| Coating durability | Low (season) | High (years) | Average (six months) |
| Appearance | Noticeable transition, dullness | Perfect gloss | Restored gloss |
| Cost | Low | High | Average |
Polishing is effective only when the defect does not affect the lower layers of the coating. If the scratch is deep and can be felt with your fingernail, polishing will only temporarily oil the edges, but will not remove the indentation. In this case, injection will fill the volume, but will change the surface texture.
Tip: If you plan to sell the car in a year, extrusion can be a cost-effective solution to achieve a marketable appearance. For yourself and long-term use, it is better to choose classic painting.
Possible defects and ways to eliminate them
The most common problem is uneven color, known as applesauce. It occurs due to poor spray technique or incorrect pressure settings. This defect can only be eliminated by completely repainting the element, since local polishing will not even out the tone.
Smudges are also possible if the master holds his hand in one place. Since the material dries instantly, it is extremely difficult to remove smudges by grinding - there is a high risk of rubbing the coating to the metal. In such cases, careful cleaning of the defective area and re-application of the composition is required.
⚠️ Attention: An attempt to wash off a fresh coating with a solvent often leads to the pigment being smeared over a larger area, which aggravates the situation and requires more complex repairs.
Cost of work and economic feasibility
The price for extrusion is determined based on the area of the surface to be treated and the type of car. For small cars compact cars the cost will be lower than for SUVs with a large area of elements. On average, local processing of one element costs 3-4 times less than full painting at a service center.
However, if you consider the cost in terms of service life, the savings may be illusory. After 6-10 months, the coating may begin to chip or fade, requiring repeated intervention. Therefore, it is important to weigh the pros and cons before making a decision.
Key takeaway: Syringing is an emergency measure or a temporary solution. For a high-quality and durable result, nothing can replace professional painting in a paint booth.
Owners should also consider the residual value of the car. If the car is old and its price is low, there is no point in investing in expensive painting, and spraying becomes the best choice. For new cars less than 5 years old, this method can reduce the resale market value.
Is it possible to wash the car after spraying?
Yes, you can wash your car, but not earlier than 24 hours after the procedure. It is recommended to use contactless washing and avoid strong water pressure in the repair area in the first few days while the final polymerization of the material takes place.
How long does the coating last after spraying?
On average, the quality of the coating lasts from 6 to 12 months, depending on operating conditions. Winter travel with reagents and frequent washing can reduce this period to 3-4 months.
What is the difference between extrusion and spot painting?
Local painting involves full preparation (sanding, primer, base, varnish) on part of the element with shading of the boundaries. Spraying is the application of material without deep preparation and often without a varnish layer, which makes it less durable.
Is syringing done at home?
Theoretically it is possible with special equipment, but in practice it is difficult. Precise pressure adjustment and cleanliness of the room are required, so it is better to entrust the work to service professionals.