Introduction to body protection
Vehicle operation Nissan Sunny in an aggressive urban environment inevitably leads to wear and tear on the lower parts of the body. Small pebbles flying from under the wheels, reagents and constant contact with curbs create the preconditions for chipping and corrosion. Plastic thresholds become an effective solution to this problem, acting as an additional screen.
Many owners Nissan Sunny ignore this element of protection until they see rust on the doors. However, prevention is always cheaper than repair. Installing high-quality plastic allows you to preserve the factory paint and prevent metal from rotting in risk areas.
In this article we will look at what types of thresholds exist, what they are made of and how to install them correctly so that they last for years. You will learn what to look for when choosing and how to avoid common installation mistakes.
Materials and design features
When choosing protection, it is important to understand the difference between cheap polypropylene and more expensive composite materials. Cheap plastic Nissan Sunny often becomes brittle in the cold, cracks on impact and loses color in the sun. High-quality products are made from impact-resistant ABS plastic or polyurethane.
Structurally, thresholds are divided into overhead and built-in. For model Nissan Sunny Most often, overhead versions are used, which are attached directly to the side of the body. They have a special shape that follows the curves of the car, and holes for fasteners.
It is important to pay attention to the presence of stiffeners on the inside. This strengthens the structure and prevents sagging during long-term use. It is also worth checking the quality of the edges - they should be smooth so as not to get stuck in the dirt.
- ✅ Impact-resistant ABS plastic - optimal balance of price and strength
- ✅ Polyurethane - high elasticity, does not crack in the cold
- ❌ Cheap polypropylene - quickly turns yellow and breaks
- ❌ Thin metal - susceptible to corrosion and deformation
Criteria for selecting a suitable model
Not all thresholds declared as universal are suitable for Nissan Sunny perfect. The body geometry of each model is unique, and universal solutions often require modifications or leave gaps where dirt gets clogged. It is better to look for specialized kits designed specifically for your year of manufacture.
Pay attention to the mounting method. Some manufacturers offer thresholds on double-sided tape, which is unacceptable for the Russian climate. The best option is a combined mount: 3M tape in combination with screws or clips. This ensures a secure hold even during vibrations.
The color scheme also plays a role. The thresholds can be black, gray or body color. Black plastic is more practical in terms of masking dirt, but can contrast with white or silver Nissan Sunny. If you want to maintain aesthetics, look for options that can be painted to match the color of the car.
⚠️ Attention! Never buy thresholds without first trying them on if they are declared as universal. A difference of millimeters can lead to them blocking access to the door seals or protruding beyond the dimensions, which is dangerous when parking.
- Impact resistant plastic
- Polyurethane
- Metal
- It doesn't matter, the main thing is cheapness
Preparing the car for installation
The success of installation depends 90% on proper surface preparation. Just glue or screw the sills to the dirty body Nissan Sunny - a sure way for them to fall off in a month. It is necessary to thoroughly clean the installation area from dust, bitumen stains and old mastic.
Use special degreasers or anti-silicone. Plain water or detergent will not remove road grease. Wipe the surface twice: first to remove coarse dirt, then to degrease. Allow the body to dry completely before starting work.
If you plan to use self-tapping screws, you will need to mark the holes. To do this, attach the threshold to the body and mark the drilling locations with a marker. It is important to ensure that the drill does not damage the paintwork deeper than necessary, so use a depth gauge.
- 🧽 Wash the bottom of doors and thresholds thoroughly
- 🧴 Treat the surface with anti-silicone or white spirit
- 📏 Make precise markings for mounting holes
- 🔧 Check that you have all the necessary tools and components
☑️ Preparation for installation
Installation process and fixation nuances
Installation begins with fitting and marking. If you are using double sided tape, remove the protective film from one side only and press the threshold against the body to check the alignment of the holes. This will avoid mistakes when the tape is already glued, but the holes do not match.
When fixing with self-tapping screws, it is important not to overtighten them. Excessive force may deform the plastic or damage the paint underneath, leading to corrosion. Use a torque screwdriver or control the force manually, tightening the fastener as far as it will go, but without fanaticism.
After installing all elements, check the reliability of fastening. Try to shake the threshold slightly with your hands - it should not move. If tape is used, allow it to cure by not driving the vehicle for 24 hours in rain or cold temperatures.
⚠️ Attention! When drilling holes in the body Nissan Sunny Be sure to apply an anti-corrosion compound to the edges of the cut. Even a microscopic scratch on the metal under the plastic will eventually turn into a rust hole.
Before final gluing of the adhesive tape, warm up the surface and the adhesive tape itself with a hair dryer. This will increase adhesion and make the connection more reliable in conditions of temperature changes.
Comparison of protection options and prices
The market offers a wide range of solutions for Nissan Sunny, from budget Chinese sets to expensive branded products. The difference in price can reach three times, but it is not always justified by quality. Cheap options often have jagged edges and poor geometry.
The table below shows the main differences between popular types of plastic thresholds:
| Product type | Material | Service life | Price | Difficulty of installation |
|---|---|---|---|---|
| Budget plastic | Polypropylene | 1-2 years | Low | Low |
| Middle segment | ABS plastic | 3-5 years | Average | Average |
| Premium | Polyurethane | 7+ years | High | High |
| Universal | Various | 1-3 years | Low | Very high |
Hidden benefits of polyurethane
Polyurethane has a unique ability to self-heal minor scratches. When heated by the sun or the heat of an engine, minor abrasions may disappear, leaving the surface smooth and new.
Care and operation of installed thresholds
Plastic thresholds require minimal maintenance, but regular cleaning will prolong their life and maintain their appearance. Avoid using harsh chemicals that can corrode or dull the plastic. Regular car shampoo and a soft sponge are your best bet.
In winter, be careful with wire brushes when removing ice. They can leave deep scratches into which dirt will accumulate. It is better to use plastic scrapers or warm water to defrost ice crusts.
It is recommended to inspect fasteners every six months. Vibration and temperature changes can loosen the screws or peel off the tape. Timely tightening of fasteners will prevent the loss of thresholds on the highway.
Regular cleaning and timely tightening of fasteners is the key to ensuring that the thresholds will last the entire stated period without loss of functionality and appearance.
Frequently Asked Questions
Do I need to drill holes to install plastic thresholds?
It depends on the type of fastening. If you use a combined method (adhesive tape + self-tapping screws), drilling is necessary. If the thresholds are attached only to powerful 3M double-sided tape, there is no need to drill, but this method is less reliable in conditions of dirt and vibration.
Is it possible to paint plastic sills in the body color of a Nissan Sunny?
Yes, it's possible. First, the plastic needs to be sanded with fine sandpaper, degreased and a plastic primer applied. Then paint is applied to match the color Nissan Sunny and varnish. This will improve the appearance, but may reduce impact resistance if the paint layer is too thick.
What to do if the threshold comes off?
It is necessary to completely remove the old layer of tape and degrease the surface. Apply a new layer of high-quality double-sided tape (for example, 3M VHB) and press the threshold firmly. It is recommended to use a hair dryer to warm up the tape before gluing.
Do plastic sills affect the vehicle's ground clearance?
No, plastic linings are installed on the sides of the body and do not affect the ground clearance (clearance) Nissan Sunny. They protect only the side parts, without creating obstacles when driving through uneven roads.
⚠️ Attention! Plastic sills are not a strength element for underbody protection. When parking on curbs, they can break if you are not careful, as they are not designed to withstand direct impacts against hard obstacles.