Rear roof spoilers — especially those mounted directly above the rear window glass — are more than aesthetic upgrades. They’re functional aerodynamic tools that help reduce rear glare, enhance airflow, and minimize UV exposure — crucial considerations for vehicles in Australia's climate. When selecting a visor-style spoiler, choosing the right material significantly impacts fitment, durability, and long-term performance.
Material Comparison for Rear Window Roof Spoilers
| Material | Best Use Case | Key Features | Cost Range |
|---|---|---|---|
| ABS Plastic | OEM-style roof spoilers mounted above rear glass | Lightweight, durable, simple to install | 💰 Lower |
| Acrylic (Perspex) | Tinted visor-style spoilers with sleek finish | UV-stable, smoked clarity, aerodynamic appearance | 💰💰 Mid |
| Fibreglass | Custom painted spoilers for stylised builds | Paint-ready, rigid, slightly heavier than plastic | 💰💰💰 High |
ABS Plastic: OEM-Grade Function
ABS plastic is widely used in factory-style spoiler applications. It hugs the rear glass curvature with a balanced blend of strength and simplicity. Most ABS spoilers install using automotive-grade tape or OEM mounting points.
- Pros: Tough under impact, budget-friendly, easy DIY install
- Cons: Limited paintability, can dull with prolonged UV exposure
Acrylic (Perspex): Premium Style & UV Performance
Perspex is the go-to material for smoked-tint spoilers. It offers excellent visual clarity and withstands high UV levels — ideal for warm climates and vehicles with side window shields.
- Pros: UV-resistant, sleek finish, trim-compatible
- Cons: Requires careful install to unlock full durability, precise mounting required
Fibreglass: Customisation-Friendly & Rigid
Fibreglass caters to full custom builds — allowing colour-matching, stylised shaping, and added rigidity for enthusiast-grade spoilers.
- Pros: Paintable, shape-friendly, heat-tolerant
- Cons: Requires prep, heavier, more labour-intensive
FAQs: Choosing a Rear Roof Spoiler Material
Do rear spoilers sit directly above the rear glass?
Yes – roof spoilers sit flush above the rear window to enhance airflow and styling without altering boot or hatch structure.
Can I paint ABS spoilers?
Yes – ABS can be painted with proper prep. Light sanding, plastic primer, and flexible paint yield the best results.
Will Perspex crack in heat?
Perspex is UV-resistant and heat-tolerant, making it ideal for Australian conditions. Cracking only occurs with poor installation or excessive stress.
Is fibreglass always heavier?
Standard fibreglass matting is heavier, but lightweight cloth variants offer reduced mass with strong rigidity for custom builds.
Why does fibreglass cost more?
Fibreglass is highly customisable but labour-intensive – requiring moulding, curing, and paint-ready prep. It's ideal for stylised builds.
Which rear roof spoiler material lasts the longest?
Perspex offers the best long-term clarity and UV resilience for parked vehicles and hot climates. ABS suits daily use, while fibreglass excels in custom applications.
| Buyer Need | Best Material | Why |
|---|---|---|
| UV-tinted clarity + visual edge | Acrylic (Perspex) | Stylish, UV-resilient, pairs with trims |
| Factory-style durability | ABS Plastic | Affordable, strong, quick install |
| Custom painted look | Fibreglass | Paintable, stylisable, high rigidity |
Explore Related Products & Resources
- Holden Commodore VT–VZ Rear Roof Spoiler – HIC Premium
- Subaru Impreza Accessories – Weather Shields and Roof Spoilers
- Roof Spoiler Installation Guide
- Spoiler Quality & Fitment Overview
Explore more premium HIC upgrades built for Australian conditions at HIC Australia
Updated November 2025