ABS vs Fiberglass vs Polypropylene Body Kits: Which Material Is Best?

Choosing a body kit is about more than appearance. One of the most important factors affecting fitment, durability, installation and long-term ownership is the material from which the kit is manufactured.

If you've started researching aftermarket body kits, you've probably come across terms like ABS plastic, polypropylene (PP) and fiberglass. Each material has its own characteristics, advantages and limitations, and understanding these differences can help you make a more informed decision.

In this guide, we'll explain the three most common body kit materials, compare their strengths and weaknesses, and discuss which option is best suited for different types of drivers.

Why Does the Material Matter?

A body kit is constantly exposed to challenging conditions.

Unlike many other aftermarket accessories, exterior components experience:

• Road debris

• Heat and cold

• UV exposure

• Rain and snow

• Car washes

• Minor impacts

• Vibration during driving

The material determines how the body kit reacts to these conditions over time.

A high-quality design made from an unsuitable material may not deliver the durability you expect, while a well-engineered component manufactured from the right material can remain in excellent condition for years with proper care.

The Three Most Common Body Kit Materials

Most aftermarket body kits are manufactured from one of three materials:

• ABS plastic

• Polypropylene (PP)

• Fiberglass (FRP)

Although carbon fiber is also used in some applications, it is generally found on premium performance vehicles and specialty racing projects rather than everyday street cars.

What Is ABS Plastic?

ABS stands for Acrylonitrile Butadiene Styrene, an engineering thermoplastic widely used throughout the automotive industry.

Many factory vehicle components---including interior trim, bumper parts and exterior plastics---are manufactured from ABS because it offers an excellent balance of strength, dimensional stability and impact resistance.

For aftermarket body kits, ABS has become one of the most widely used materials for OEM+ style products.

Advantages of ABS

• Good impact resistance

• Consistent manufacturing quality

• Smooth surface for painting

• Accurate moulded details

• Stable dimensions

• Suitable for daily driving

• Resistant to normal weather conditions

Considerations

Like any material, ABS has limitations.

Extremely hard impacts can still damage the component, and the overall quality depends on the manufacturing process rather than the material alone.

What Is Polypropylene (PP)?

Polypropylene, often abbreviated as PP, is another thermoplastic commonly used by vehicle manufacturers.

Many original factory bumpers are produced from polypropylene because of its flexibility and ability to absorb minor impacts.

Some aftermarket body kits also use PP, particularly larger components.

Advantages of PP

• Excellent flexibility

• Good impact absorption

• Resistant to cracking

• Lightweight

• Well suited to daily-driven vehicles

Considerations

Polypropylene can be more challenging to repair and paint correctly than some other materials, making proper preparation especially important.

What Is Fiberglass?

Fiberglass, also called FRP (Fiber Reinforced Plastic), has been used in aftermarket automotive parts for decades.

It consists of fiberglass cloth combined with resin to create rigid panels.

Fiberglass remains popular because moulds are relatively inexpensive to produce, allowing manufacturers to create complex shapes and lower-volume designs.

Advantages of Fiberglass

• Can produce highly detailed designs

• Suitable for limited-production components

• Relatively economical tooling

• Easy to modify during fabrication

• Common in motorsport and custom projects

Considerations

Fiberglass is generally less flexible than ABS or polypropylene. Depending on design, manufacturing quality and installation, it may be more susceptible to cracking when subjected to significant impacts or repeated stress.

			Material Comparison
Feature	ABS	Polypropylene (PP)	Fiberglass Plastic
Impact resistance	Excellent	Excellent	Moderate
Flexibility	Good	Excellent	Low
Surface finish	Excellent	Good	Good
Factory-style appearance	Excellent	Excellent	Good
Weight	Light	Very light	Moderate
Everyday durability	Excellent	Excellent	Good

No material is universally "best." The right choice depends on the intended application, manufacturing quality and design objectives.

Which Material Is Best for Daily Driving?

For most drivers looking to improve the appearance of their vehicle while maintaining everyday usability, thermoplastics such as ABS and polypropylene are generally preferred.

These materials combine:

• Good durability

• Consistent manufacturing

• Practical flexibility

• Factory-style appearance

This combination has made them popular not only in the aftermarket but also among original vehicle manufacturers.

Which Material Is Best for Show Cars?

Show cars often prioritize appearance over everyday practicality.

Fiberglass remains a popular choice for custom projects because it allows manufacturers and fabricators to create highly specialized designs that may not be practical for mass production.

For vehicles that are transported to events or driven only occasionally, the priorities can differ significantly from those of a daily-driven car.

Does Material Affect Fitment?

This is one of the biggest misconceptions.

Material alone does not determine how well a body kit fits.

Fitment depends on many factors, including:

• Vehicle-specific engineering

• CAD design

• Manufacturing tolerances

• Quality control

• Installation

• The condition of the vehicle itself

A poorly designed ABS component can fit worse than a well-engineered fiberglass one.

Likewise, a carefully manufactured thermoplastic kit can achieve excellent alignment when designed specifically for the intended vehicle.

What About Painting?

All body kit materials require proper preparation before painting.

Professional body shops typically:

• Inspect the surface

• Prepare the material

• Apply appropriate primers

• Paint using automotive-grade coatings

• Finish with a clear coat where applicable

Proper preparation is often more important than the material itself when it comes to achieving a durable finish.

Which Materials Does Yofer Use?

Yofer follows an OEM+ design philosophy focused on creating vehicle-specific exterior upgrades that complement factory styling.

Many Yofer body kits are manufactured using automotive-grade ABS plastic and polypropylene (PP)---materials widely used throughout the automotive industry because they combine durability, consistent manufacturing quality and suitability for everyday driving.

The specific material may vary depending on the component and vehicle application, so owners should always refer to the product description for the exact specifications of the kit they are considering.

Final Thoughts

The question isn't simply "Which material is best?"

A better question is:

"Which material is best for my intended use?"

If you're building a dedicated show car, your priorities may differ from someone who drives their vehicle every day.

For most daily-driven cars, high-quality thermoplastics such as ABS and polypropylene offer an excellent balance of durability, appearance and practicality. Fiberglass continues to play an important role in custom fabrication and specialty applications, particularly where unique designs or low-volume production are required.

Ultimately, the quality of the engineering, manufacturing and installation will have just as much influence on the final result as the material itself.

Frequently Asked Questions

Is ABS better than fiberglass?

Neither material is universally better. ABS generally offers greater impact resistance and flexibility for everyday driving, while fiberglass is often preferred for custom or low-volume designs.

What is PP plastic?

PP stands for polypropylene, a thermoplastic commonly used by automotive manufacturers for bumper covers and other exterior components because of its flexibility and durability.

Why do many factory bumpers use polypropylene?

Polypropylene combines light weight with excellent impact resistance and flexibility, making it well suited for everyday driving conditions.

Can fiberglass body kits crack?

Fiberglass is generally more rigid than thermoplastics and may be more susceptible to cracking if subjected to significant impacts or stress.

Which material is easiest to paint?

All materials can produce excellent results when prepared correctly by an experienced body shop. Proper surface preparation is essential regardless of the material.

Does the material determine fitment?

No. Fitment depends primarily on engineering, manufacturing quality, vehicle-specific design and correct installation.

What material do most OEM+ body kits use?

Many OEM+ body kits are manufactured from automotive-grade ABS plastic or polypropylene because these materials are widely used throughout the automotive industry.

Which material lasts the longest?

Longevity depends on manufacturing quality, installation, environmental conditions and maintenance rather than the material alone.