Car owners are often faced with the need to replace or repair external body elements, but do not always know their exact technical names. When it comes to the plastic that frames the door, protects it from scratches, or simply decorates the silhouette, confusion arises in colloquial speech. Some call it “body kit,” others call it “protection,” but to correctly search for spare parts in catalogs or talk with a salesperson in an auto parts store, you need to know professional terminology.
In this article, we will look in detail at the correct name of the plastic door trim, what its varieties are, and why your car needs it. Understanding the difference between molding, threshold trim and handle protection will help you avoid mistakes when purchasing and carry out quality repair work. We will look at materials, fastening methods and nuances of caring for these elements.
Main Name: Door Molding
The most common term you will hear in auto repair shops and stores is molding. This is the name given to the long plastic or rubber trim that runs along the side of the car, often located at the level of the handles or just below the line of the windows. The main function of this element is to protect the paintwork of the door from impacts from neighboring cars in the parking lot and from stones flying from under the wheels.
Structurally molding can be made of hard plastic, soft polyurethane or a combination of rubber and chrome. In modern cars such as Hyundai Solaris or Kia Rio, moldings are often part of the overall sidewall design, visually elongating the silhouette. If the pickguard is made of metal or has a metal coating, it may also be called edging, although today plastic dominates due to its flexibility and resistance to corrosion.
Fastening of moldings is carried out in two main ways: with a special adhesive layer (3M double-sided tape) or with plastic snap clips. Dismantling adhesive-based molding requires heating it with a hairdryer to a temperature of 60-70 degrees, otherwise there is a high risk of damaging the paintwork of the door or breaking the lining itself. Removing elements on clips is done using a special spatula, but requires caution so as not to damage the attachment points.
⚠️ Attention: When purchasing non-original moldings, pay attention to the geometry. Cheap plastic may have an uneven thickness, which is why the trim will move away from the body in the middle part or, conversely, puff up at the edges.
Moldings also perform a decorative function, hiding the joints of body panels or technological holes. On some models, for example Volkswagen Polo, they are integrated into the overall line of the window opening. Replacing such an element requires precise selection according to the VIN code, since even a slight deviation in length will lead to a violation of tightness or aesthetics.
Door handle cover
The element protecting the area around the door handle deserves special attention. In spare parts catalogues, this part often appears as handle cover or "pen pocket". It is designed to protect the paint from scratches from rings, keys and fingernails in the area where most human contact occurs with the vehicle.
Often such overlays are made in the form of chrome frames or matte plastic inserts. On business class cars such as Toyota Camry or Skoda Octavia, these elements can be part of a complex decorative package. The plastic used here is high quality, UV resistant, so that over time it does not turn yellow or lose its shine.
Installing a trim under the handle is one of the most popular types of tuning. Owners often replace the standard black parts with chrome or body-colored ones. The installation process is usually simple: the surface is degreased with alcohol or anti-silicone, after which a new element is glued. It is important not to touch the adhesive surface and the part itself in the contact areas with your fingers.
- 🚗 Chrome trims - give the car a more expensive and elegant look, but require regular polishing to remove plaque.
- 🛡️ Carbon-look linings - a popular choice for sports versions of cars, they imitate the structure of carbon fiber.
- 🎨 Painted in body color — are integrated into the design as much as possible, making the element almost invisible, but protecting the metal.
Sill protection and lower edging
The lower part of the door, which goes into the threshold, is also often equipped with plastic trim. Their correct name is door sills or external sill moldings. They take the brunt of the impact from dirt, sand, reagents and the heels of passengers. Without protection, the metal in this area quickly begins to corrode.
Modern door sill covers are often made from durable ABS plastic or polypropylene. On SUVs such as Renault Duster or Toyota Land Cruiser, they can be massive and corrugated, serving as a footrest. On passenger sedans these are thin plastic strips that follow the curve of the body.
If the outer sill trim is damaged, replacing it often requires removing the interior plastic trim to gain access to the mounting bolts or clips. This is a more labor-intensive process than replacing the molding on the outside of the door. Tightness The interface between the trim and the body is critical to preventing hidden corrosion.
| Overlay type | Material | Mounting method | Main function |
|---|---|---|---|
| Side molding | Polyurethane / Rubber | Clips / Scotch tape | Impact protection |
| Handle cover | ABS plastic / Chrome | Double sided tape | Decor and scratch protection |
| Threshold trim | Polypropylene | Self-tapping screws/clips | Protection against dirt and corrosion |
| Glass edging | Plastic / Aluminum | Insert into groove | Decorative |
Manufacturing materials and their properties
The choice of material for plastic linings directly affects their service life and appearance. The most common material is ABS plastic. It is durable, holds its shape well and lends itself well to painting. This is what most factory moldings and handle trims are made from.
For elements that must absorb impacts (for example, side moldings), polyurethane or rubber is often used. These materials are highly elastic. After an impact, they return to their original shape, while hard plastic can crack. However, rubber elements are more difficult to paint in body color, since the paint does not adhere well to the elastic surface.
When purchasing sticker moldings on adhesive tape, choose products with a base made of acrylic foam (VHB) - it better compensates for body vibrations and temperature changes than regular thin tape.
Chrome trims are usually plastic with an electroplated coating. They look impressive, but over time, chrome can begin to “peel off” or become covered with microcracks, especially under the influence of aggressive automotive chemicals. Chinese analogues They often suffer from the poor quality of chrome, which becomes cloudy after just one winter season.
⚠️ Attention: Never use aggressive solvents (acetone, 646 solvent) to clean chrome or glossy plastic trim. This will lead to irreversible clouding of the surface and the appearance of a network of cracks.
Replacement and installation instructions
The process of replacing the plastic cover depends on its type and method of attachment. If you plan to do this job yourself, you will need a minimum set of tools: a heat gun, degreaser, a new part, and perhaps a set of clip removers.
To dismantle the old adhesive-based pad, it is necessary to evenly heat its surface. Do not hold the hair dryer at one point for a long time so as not to overheat the body paint. Movements should be smooth. After warming up, carefully lift the edge of the cover and, slowly pulling it out at an angle of 45 degrees, remove the element. Remove any remaining adhesive using a special compound or a rubber roller.
☑️ Checklist before installing a new overlay
Installation of a new part is carried out on a clean, dry and grease-free surface. Temperature important: it is optimal to carry out work at ambient temperatures above +15°C. If the installation takes place in an unheated garage during the winter, the tape may not adhere properly and the trim will fall off within a week.
What to do if the fasteners are broken?
If, when removing the old trim, you damaged the seats for the clips on the body, you can use a special two-component glue for plastic or drill out the remains and install universal repair bushings. However, this is not relevant for moldings on tape.
Care and restoration of appearance
Plastic linings require regular maintenance to maintain a presentable appearance. Black, unpainted plastic fades over time in the sun, acquiring a grayish, faded tint. To restore color there are special plastic restorers and inks.
It is enough to regularly wash chrome elements with shampoo and wipe with microfiber. Wax polishes can be used to protect against oxidation. Gloss painted trims (body color) are polished in the same way as the rest of the car, but require care on the edges to avoid rubbing off the paint layer.
Regular application of protective compounds will extend the life of moldings. Ceramic coatings for plastic create a hydrophobic layer that repels dirt and water, which is especially important for thresholds and lower moldings. This makes washing your car easier and keeps it looking neat.
Timely treatment of plastic elements with protective compounds (UV protection, ceramics) increases their service life by 2-3 times and prevents color fading.
Can black plastic molding be painted to match the body color?
Yes, this is possible, but it requires special training. Regular paint does not stick to smooth plastic. It is necessary to use a special adhesive primer for plastic (primer), then base enamel and varnish. Without a primer, the paint will peel off in chunks after a short time.
What is the best way to glue a fallen molding if the tape does not hold?
Do not use liquid nails or superglue - they can corrode the plastic or damage the paint. The best option is to replace the double-sided tape with a new, high-quality one (for example, 3M VHB). If additional fixation is needed, you can use transparent glass sealant, but this will complicate future dismantling.
Why do white or light-colored linings turn yellow?
Yellowing of plastic occurs under the influence of ultraviolet radiation and oxidation of the surface layer. Cheap plastic turns yellow faster. The original color can only be restored by mechanical removal of the damaged layer (grinding) and subsequent painting; chemical restorers are ineffective here.
How to distinguish high-quality molding from a cheap analogue?
A high-quality molding has a uniform structure, is flexible (does not break when bent by hand), and the geometry of its edges perfectly follows the curves of the body. The cheap alternative is often hard, has burrs, uneven thickness and may vary in shade (for example, black with a bluish tint instead of deep black).