The thresholds of the car are one of the most vulnerable areas of the body, which is exposed to aggressive environmental influences on a daily basis. Stones flying out from under the wheels in front of the cars, sand, gravel and reagents, which are sprinkled with roads in winter, leave deep scratches and chips on the paintwork. Over time, these damages can lead to the appearance of rust, the fight against which will require serious intervention and financial investments comparable to painting the element.
A modern and effective solution to the problem is door-streetIt creates a strong barrier between the body and external factors. This material, often called anti-gravel film or polyurethane armor, is virtually invisible on a car but is able to withstand stone impacts at high speed. Unlike chrome plates, which can oxidize or peel off over time, the transparent film retains the factory appearance of the machine, remaining invisible to the prying eye.
In this article, we will discuss in detail what types of films exist, how to properly prepare the surface before installation and whether it is worth installing with your own hands or it is better to entrust it to professionals. Understanding the nuances of material selection will help you avoid common mistakes and save the budget for expensive body repairs in the future.
Types of materials: polyurethane or vinyl?
When choosing protection for thresholds, the car owner faces the question: which material is better? The market is dominated by two main types of films: polyurethane (TPU) and vinyl (PVC). Polyurethane film It is considered a premium option, which has high elasticity and the ability to โtightenโ small scratches under the influence of heat. It is much thicker than vinyl and can withstand more severe mechanical loads, which is critical for the bottom of the doors.
Vinyl films are cheaper to manufacture, but their protective properties are limited. They protect well from sandblasting and small stones, but with a strong impact with a large gravel, vinyl can break, transferring the energy of the impact to the body. In addition, vinyl is less resistant to aggressive chemistry and temperature changes, with time turning yellow and losing transparency.
There is also a division by type of surface: matte or glossy. Matte anti-gravel film It is often used to create contrasting design elements or to protect black plastic sills without changing their texture. Glossy is ideal for painted elements, merging with the varnish and creating the effect of โsecond skinโ.
When choosing a film, pay attention to the presence of a hydrophobic upper layer - it facilitates cleaning the thresholds from dirt and reagents in winter.
It is important to note that the quality TPU film It costs 2-3 times more expensive than a vinyl analog, but its service life is calculated 5-7 years or more, while vinyl may require replacement after 2-3 years of operation.
Advantages of Using Anti-Gravity Protection
Installation of protection on the doorsteps is an investment in preserving the presentation and value of the car during resale. A car with a whole paintwork always looks fresh and more attractive to a potential buyer. In addition, the presence of chips on the doorsteps often becomes a reason for understating the price during the auction, as the new owner understands the scope of upcoming restoration work.
Modern materials have not only mechanical strength, but also chemical resistance. They protect the metal from road reagents, salt and bitumen stains that can corrode the varnish and paint. Anti-corrosion properties This protection consists in the complete sealing of the surface, preventing moisture and oxygen from contacting the metal even in the presence of microscopic defects under the film.
- ๐ก๏ธ High impact resistance: The material can withstand stone impacts at speeds up to 150 km / h without tears.
- ๐ค๏ธ UV filter: prevents paint from burning out under the film, keeping the body color uniform throughout the car.
- ๐งผ Self-healing: Small scratches from sinks and branches disappear when heated in the sun or from warm water.
- ๐ Aesthetics: The glossy versions enhance the depth of color, and the matte ones give the car a unique look.
Another important aspect is the ease of care. The smooth surface of the film is less polluted, and the ingrained dirt from it is much easier to remove than from rough varnish chipped. This is especially true for owners of dark cars, where any defects are visible in the palm of your hand.
The main value of anti-gravel film is the preservation of the factory paint layer, which cannot be recreated in the service with the same quality.
Comparative table of material characteristics
To finally decide on the choice, it is worth comparing the key parameters of different types of protection. The data in the table are based on averaged indicators of manufacturers' tests and reviews of installation centers.
| Parameter | Polyurethane (TPU) | Vinyl (PVC) | chrome linings |
|---|---|---|---|
| Micron thickness | 180-220 ฮผm | 100-140 ฮผm | 1-2 mm (plastic/metal) |
| Term of service | 5-7 years | 2-3 years | 3-5 years |
| Impact protection | Tall. | Medium | Low (only from scratches) |
| Self-healing | There is. | No. | No. |
| Impact on LCP | Safe. | Safe. | Risk of moisture accumulation under the lining |
As you can see from the comparison, chrome-plate They perform a rather decorative function and protect only from slight scratches when landing in a car, but do not save from gravel. Vinyl is good as a budget solution for urban conditions where the speed of movement is low. Polyurethane remains the uncontested leader for road operations and harsh winter conditions.
Why is polyurethane more expensive?
Polyurethane is produced by a more complex technology, including a multilayer structure with an elastic base and a strong facial layer, which provides its unique properties.
Installation technology: preparation and process
The quality of protection directly depends on the correctness of surface preparation and compliance with the technology of sticking. The process begins with thorough washing and degreasing of the thresholds. Any remaining grain of sand under the film will become a center of tension and can lead to flaking of the material or the appearance of a bubble.
Then comes the cutting phase. Professionals use plotters to cut patterns with millimeter accuracy, which allows you to close all the faces and wrap the edges of the film on the inside of the threshold. Seamless pasting Ensure that water and dirt do not fall under the protection. With manual cutting, there is a high risk of leaving open areas where corrosion will begin over time.
โ๏ธ Stages of preparation for pasting
Directly gluing is made wet or dry. For thresholds, a wet method is more often used using a soap solution, which allows you to position the film before the final distillation of water. However, polyurethane with an active adhesive layer may require dry-mount with warming up to activate adhesion. It is important not to stretch the film excessively to avoid the โwebโ effect or color change in stretched areas.
The final stage involves drying and polymerization of the adhesive. For 24-48 hours, it is not recommended to wet the car or expose the rapids to high water pressures at the sink. Complete adhesion is achieved after a few days, after which the film can be washed with conventional autochemistry.
Frequent errors in self-installation
Trying to save on the services of masters and stick the protection yourself often leads to disappointment. One of the most common mistakes is not enough degreasing. The owner can wash the car, but forget to use a special degreaser, causing the film to leave after a week along with the remains of wax or polish.
Another problem is the ingestion of dust and pile. In garage conditions, it is extremely difficult to achieve the sterility necessary for high-quality pasting. Dust stuck under the film, not only spoil the appearance, but can also become foci of corrosion, as under them formed micro-humidity. Temperature regime It is also critical: in cold, the glue does not work, and in heat, the film becomes too viscous and can be deformed.
โ ๏ธ Warning: Never use acetone-based solvents or aggressive household chemicals for degreasing โ they can damage the factory varnish or the film structure itself before it is installed.
Another mistake is saving on material. Buying a cheap โantigraviykaโ from marketplaces without certificates often turns into the fact that after six months the film becomes cloudy, cracks on the folds or, worse, sticks to the varnish, and it is impossible to remove it without damaging the paint. In such cases, the thresholds must be repainted.
If you still decide to glue yourself, be sure to use rackels with soft felt, so as not to leave scratches on the film itself during the process of distilling water.
Film care and service life
Anti-gravel film does not require complex care, but compliance with simple rules will prolong its life and keep a neat appearance. Washing a car with protected rapids can be done at regular washes, including using high-pressure devices, but the jet should be directed at an angle, not perpendicular to the edge of the film, so as not to drive water under the material.
To maintain hydrophobic properties and shine, it is recommended to apply a special sealant or ceramic coating for films every 3-4 months. This will fill the micropores of the upper layer and make it easier to wash away the dirt. Abrasive polishes can not be used - they will erase the protective layer and make the film matte.
Quality service life TPU film It's an average of 5-7 years. Signs that it is time to change the protection are: clouding, which is not removed by polishing, deep cuts to paint, detachment of the edges or color change (yellowness). Removal of the old film in a specialized center usually passes without a trace, returning the body to its original appearance.
โ ๏ธ Attention: If you detect a deep through cut on the film do not delay with repair - moisture can penetrate under the layer of protection and start the process of corrosion of the metal.
Regular inspection of thresholds after the winter season will allow you to notice defects in time and take measures. Remember that film is an expendable material that takes the blow on itself, maintaining the integrity of an expensive body element.
Can I polish the film on the doorsteps?
Yes, you can polish, but only soft, abrasive compositions. The use of polishing machines with rigid circles and aggressive chemistry is prohibited, as this will thin the protective layer and lead to clouding.
Does the film delay corrosion if it has already begun?
No, you can't glue the film on the rust. It is the law to preserve the problem, but the process of rotting will continue under film at a double rate. Before pasting, all foci of corrosion should be eliminated.
Is there any film on the black car?
The quality transparent film on a black car is almost invisible. It can give a light gloss that even enhances the look, making the color deeper. In the sun, you can see the effect of the โorange peelโ from the structure of the material, but only on very close examination.
What to do if the film is scratched?
Small scratches will heal themselves in the sun. If the scratch is deep, but not through, you can try local heating with a hairdryer. Through-through damage requires the replacement of a fragment or the entire film band.