Can I put a spoiler on my car by myself?
Yes—many aftermarket spoilers can be installed by a DIY enthusiast using common tools and proper instructions. However, larger or more complex spoilers, especially those that require drilling or affect electrical systems, are often best handled by a professional.
Assessing the idea
Installing a spoiler is not just about looks. It can affect aerodynamics, weight, weather sealing, and even warranty. Start by assessing your vehicle and the spoiler you want.
Types of spoilers
Common spoiler styles fall into three broad categories, each with its own installation approach and considerations:
- Lip spoilers — small, subtle additions mounted on the edge of the trunk or bumper using adhesive tape.
- Decklid spoilers — low-profile panels mounted flat on the trunk lid, often with pre-drilled holes or bonding surfaces.
- Wing-style spoilers — larger, aero-focused designs that can be either glued or bolted, sometimes requiring drillings and more structural attention.
Choosing the right style depends on your car, local weather, and how aggressive you want the look to be, as well as whether the spoiler must preserve the third-brake-light visibility.
Tools and materials you'll need
Most DIY spoiler installs use a combination of adhesive bonding and, in some cases, mechanical fasteners. Gather these supplies before you start.
- Automotive-grade double-sided tape (often 3M VHB or equivalent)
- Automotive sealant or silicone for weatherproofing
- Alcohol or panel cleaner for surface prep
- Microfiber cloths and masking tape for alignment
- Rubbing compound or wax to restore paint on removal if needed
- Drill and appropriate bits if you plan to bolt the spoiler on (optional for some designs)
- Grommets, washers, and screws suitable for exterior use (if required by the spoiler)
- Clamps or helper to hold the spoiler during bonding
Always follow the spoiler manufacturer's instructions, as some models come with specific mounting hardware and torque specs.
Step-by-step DIY installation (adhesive-based spoilers)
These steps cover the most common adhesive-based installation. If your spoiler uses bolts, consult the manual for drilling patterns and hardware.
- Verify compatibility: confirm the spoiler is designed for your make, model, and year, and check clearance for the trunk lid and third brake light.
- Prepare the surface: wash and dry the area, then use rubbing alcohol to remove wax, oil, and residue. Lightly scuff the mounting area with a pad if recommended by the manufacturer.
- Pre-fit and mark: place the spoiler on the trunk to check alignment; use masking tape to mark positions against the surface.
- Test-fit with tape: apply the tape to the spoiler and press it onto the marked area to verify fit without committing to permanent bonding.
- Apply bonding material: remove the protective film from the tape and apply it to the spoiler edges, or follow the manufacturer’s instructions for adhesive application.
- Attach and press: carefully position the spoiler and press firmly along the entire length for the recommended duration, using clamps if needed; ensure a uniform bond.
- Seal and cure: apply a bead of sealant along the joint if recommended; allow the adhesive to cure for the time specified by the manufacturer before driving or washing the car.
- Test function and paint protection: close the trunk fully to ensure no interference; inspect for paint damage and apply touch-up if needed.
With adhesive-based installs, patience is key to ensure a lasting bond. Rushing can lead to misalignment or bond failure.
When bolts are involved
Some spoilers require drilling into the trunk or mounting surface. This approach provides a sturdier mount but carries higher risk of rust, leaks, or paint damage if done incorrectly.
- Mark drilling points precisely using the pre-drilled holes or template provided by the manufacturer.
- Drill pilot holes with appropriate task-specific bits, using masking tape to prevent slipping.
- Install grommets and weatherproof fasteners; tighten to manufacturer torque specs.
- Apply interior sealant or seam sealer to protect against water intrusion; re-check alignment.
- Recheck function and aesthetics, and avoid overpowering the trunk mechanism.
Only proceed with drilling if the spoiler manufacturer explicitly instructs it and your vehicle’s structure can accommodate it.
Safety, warranty, and legality
Modifications can impact warranties, insurance, and local regulations. Consider these factors before proceeding.
- Warranty impact: aftermarket alterations may affect parts of the warranty if the modification causes damage or is not installed per the manufacturer’s guidelines.
- Insurance implications: some policies require notification of modifications to maintain coverage; failure to disclose can affect claims.
- Articulation and visibility: ensure the spoiler does not block the third brake light or impede visibility in any weather condition.
- Weatherproofing and corrosion: improper sealing can lead to water intrusion and rust around the mounting area.
- Local regulations: most places do not ban spoilers outright, but protruding components or sharp edges could raise concerns; check your jurisdiction’s vehicle modification laws if you expect to pass inspections or emissions tests.
If the spoiler touches or impedes any safety systems or the trunk’s operation, seek professional installation or choose a different design.
When to hire a professional
Consider professional installation if you are unsure about alignment, drilling, or warranty implications, or if your spoiler requires complex electronics (e.g., brake-light integration) or structural modifications.
Professional shops can ensure precise fit, proper sealing, paint-match finishing, and warranty-compliant installation, reducing the risk of water leaks, paint damage, or misalignment.
Summary
Installing a spoiler yourself is feasible for many lip and decklid designs using adhesive bonding and careful surface preparation. For large wings, spoilers that require drilling, or models with electrical components, professional installation is often the safer route to preserve aesthetics, function, and warranty.
