best undercoating for gm trucks with 10 Top Picks

When I first bought my GM truck, I knew I wanted to protect my investment from rust and corrosion, especially living where road salt and harsh weather are a constant threat. Finding the best undercoating for GM trucks felt like a deep dive into endless options, but through some hands-on experience and research, I’ve gathered some top contenders. This guide will walk you through various undercoating products, including some application tools, to help you make an informed decision and keep your truck looking great and lasting longer.

IMAGE	PRODUCT NAME	AMAZON LINK
	ACDelco GM Original Equipment 10-1017 Rubberized Paintable…	View on Amazon
	Raptor Truck Bed Liner Kit with Colored GM White Tint…	View on Amazon
	Raptor Truck Bed Liner Kit with Colored GM White Tint…	View on Amazon
	Raptor Truck Bed Liner Kit with Colored GM White Tint…	View on Amazon
	3M Rubberized Undercoating Aerosol Spray, 08883, 19.7 oz,…	View on Amazon
	Undercoating Spray Gun Kit, Undercoating Gun for Vehicles,…	View on Amazon
	Custom Coat GM White 2 Quart (1/2 Gallon) Urethane…	View on Amazon
	Genuine GM Fluid 12378398 Rubberized Aerosol Undercoating -…	View on Amazon
	Raptor Truck Bed Liner Kit with Colored GM White Tint…	View on Amazon
	TCP Global Air Undercoating Spray Gun with Gauge, Includes…	View on Amazon

1. ACDelco GM Original Equipment 10-1017 Rubberized Paintable Undercoating

This ACDelco undercoating is a great choice if you’re looking for an OEM-spec product designed specifically for GM vehicles. It comes with a handy extension tube, making it easier to reach those tight, hidden spots under your truck. The formula is designed to remain flexible even after it dries, which is crucial for preventing cracks and ensuring long-lasting protection against corrosion on your GM’s undercarriage and door skins.

Key features that stand out:
– OEM Quality: Specifically engineered to meet GM’s standards.
– Flexible Application: Includes an extension tube for hard-to-reach areas.
– Durable Protection: Remains flexible after drying to resist corrosion effectively.

Pros:
– OEM quality ensures compatibility and reliability for GM trucks.
– Flexible formula resists cracking from vehicle movement and temperature changes.
– Easy application with the included spray nozzle and extension.
Cons:
– It’s a paintable formula, but some users might prefer a dedicated, non-paintable option for maximum thickness.
Best for: GM truck owners who want an OEM-grade, flexible, and paintable undercoating solution for general protection and hard-to-reach areas.
Expert Opinion: This product is a solid choice for maintaining your GM truck’s factory-level corrosion resistance. Its flexibility is a key advantage, especially for dynamic undercarriage components.

2. Raptor Truck Bed Liner Kit with Colored GM White Tint

The Raptor Truck Bed Liner Kit offers serious protection that goes beyond just the bed; it’s a fantastic option for undercoating too. This specific kit comes with a GM White tint, making it possible to match your truck’s color if you’re applying it to visible areas or just want a clean finish. It’s formulated to be incredibly tough, protecting against rust, scratches, and water damage, and is surprisingly easy to repair if needed.

Key features that stand out:
– Ultra Scratch Resistant: Formulated to withstand heavy wear and tear.
– Tintable: Comes with GM White tint for a customized, seamless finish.
– Waterproof & Versatile: Ideal for marine, commercial, and industrial applications, and can adhere to multiple surfaces.

Pros:
– Provides extreme protection against rust, scratches, and water.
– Customizable color with the included GM White tint.
– Very versatile; can be applied to metal, wood, concrete, and more.
Cons:
– The multi-step application process might be more involved than a simple aerosol spray.
Best for: GM truck owners seeking a highly durable, customizable, and versatile undercoating that offers superior scratch and rust protection and can be color-matched.
Expert Opinion: While primarily a bed liner, its robust, tintable, and waterproof properties make it an excellent, long-lasting undercoating, especially for areas exposed to severe abrasion.

3. Raptor Truck Bed Liner Kit with Colored GM White Tint (Durability Focus)

This Raptor kit, also with a GM White tint, stands out for its sheer durability. If you’re tackling rough terrains or just want the peace of mind that comes with a virtually indestructible coating, this is it. It’s formulated to protect almost any surface against rust, scratches, and water damage, boasting an ultra scratch-resistant finish that’s remarkably easy to repair should the rare instance of damage occur.

Key features that stand out:
– Exceptional Durability: Built to protect against rust, scratches, and water damage.
– Easy Repair: Simple to touch up if the surface is ever damaged.
– UV Protected: Formulated to maintain vibrant color and prevent chalking in harsh conditions.

Pros:
– Provides an extremely tough, long-lasting protective layer.
– Repairs are straightforward, extending the life of the coating.
– UV protection ensures the color (even if used for undercoating) remains stable.
Cons:
– Requires proper surface preparation for optimal adhesion and longevity.
Best for: GM truck owners prioritizing the highest level of abrasion resistance and long-term durability for their undercarriage, especially in demanding environments.
Expert Opinion: This kit is a warrior. Its ability to shrug off impact and resist fading makes it a top-tier choice for trucks that see heavy use and need maximum protection.

4. Raptor Truck Bed Liner Kit with Colored GM White Tint (Versatility Focus)

Another iteration of the popular Raptor Truck Bed Liner Kit, this one with GM White tint, highlights its incredible versatility. It’s not just for truck beds; its formulation makes it suitable for guarding almost any surface from damage. Being totally waterproof, it’s great for applications where moisture is a concern, like marine use or protecting vulnerable underbody components on your GM truck from road splash and salt.

Key features that stand out:
– Broad Versatility: Can be used on metal, wood, concrete, plaster, and more.
– Completely Waterproof: Offers robust protection in wet conditions.
– Included Spray Gun: Simplifies the application process right out of the box.

Pros:
– Multi-surface application makes it adaptable for various undercoating needs.
– Waterproof properties offer superior rust prevention.
– The included spray gun aids in achieving an even, professional finish.
Cons:
– May require a compressor capable of handling spray gun applications.
Best for: GM truck owners looking for a highly versatile undercoating that can protect various surfaces, including less conventional areas, and requires robust waterproofing.
Expert Opinion: The true strength here is its adaptability. From rocker panels to frame rails, this coating’s comprehensive protection and ease of application with the included gun make it a go-to for many DIYers.

5. 3M Rubberized Undercoating Aerosol Spray, 08883, 19.7 oz

This 3M Rubberized Undercoating is a straightforward, effective aerosol solution for protecting your GM truck. It’s multi-purpose, suitable for cars, trucks, vans, and RVs, and provides an anti-corrosive coating that shields your vehicle’s undercarriage from rust and abrasion. Beyond protection, it also helps reduce road noise with its sound-dampening properties, which is a nice bonus for a quieter ride. Note: This product is labeled for industrial/occupational use only and not for consumer sale or use.

Key features that stand out:
– Noise Reducing: Helps dampen road noise for a quieter cabin.
– Anti-Corrosive Coating: Provides a strong barrier against rust and abrasion.
– Easy Aerosol Application: Simple spray-on process.

Pros:
– Effective at reducing road noise and vibrations.
– Offers robust protection against rust and abrasive damage.
– Convenient aerosol application for DIY enthusiasts.
Cons:
– It is not paintable, limiting aesthetic options for visible areas.
Best for: Industrial or occupational users seeking a quick, effective, rubberized undercoating solution for rust prevention and sound dampening on GM trucks and other vehicles.
Expert Opinion: For professionals, this 3M spray is a reliable performer, offering excellent sound deadening alongside strong corrosion resistance. The ease of application is a major plus for quick jobs.

6. Undercoating Spray Gun Kit, Undercoating Gun for Vehicles

This isn’t an undercoating product itself, but a crucial tool for applying various coatings, including the best undercoating for GM trucks. This professional spray gun kit is designed for automotive rustproofing, rubber undercoating, and truck bed liner coatings. What really sets it apart are the two 360° extension tubes, allowing you to reach deep into crevices and hollow frames for complete rust preventive coverage.

Key features that stand out:
– 360° Spray Coverage: Two extension tubes ensure no spot is missed in hard-to-reach areas.
– Adjustable Flow Rates: Precisely control for different coating viscosities and textures.
– High Performance: Features an adjustable nozzle and pressure regulator for fine-tuning atomization.

Pros:
– Provides comprehensive coverage in tight and hollow spaces.
– Offers excellent control over spray pattern and material flow.
– Easy-grip handle and snap-lock canister design enhance user experience.
Cons:
– Requires an air compressor, which is an additional investment if you don’t already own one.
Best for: DIY enthusiasts and automotive professionals who want a dedicated tool to apply undercoating materials effectively and thoroughly to their GM trucks.
Expert Opinion: A good undercoating product is only as good as its application. This gun kit elevates your DIY game to a professional level, ensuring thorough coverage, especially in critical, hidden areas.

7. Custom Coat GM White 2 Quart (1/2 Gallon) Urethane Undercoating

The Custom Coat Urethane Undercoating kit provides a professional-grade solution with a GM White tint option, similar to the Raptor kits, for your GM truck. This 2-quart kit gives you enough material to cover a significant area. It’s a heavy-duty, 2-part urethane coating that’s incredibly durable, long-lasting, and designed to withstand extreme temperatures, UV exposure, and water. Its flexible nature means it resists chipping, offering excellent impact protection and abrasion resistance.

Key features that stand out:
– Heavy-Duty 2-Part Urethane: Provides superior durability and flexibility.
– Heat, UV, and Waterproof: Excellent protection against various environmental factors.
– Dampens Sound & Vibrations: Helps create a quieter and smoother ride.

Pros:
– Delivers a highly durable, textured, protective finish that resists chipping.
– Effective at dampening sounds and vibrations for improved comfort.
– Versatile for use on truck beds, chassis, bumpers, and even home applications.
Cons:
– Mixing and application require careful attention to detail for best results.
Best for: GM truck owners looking for a robust, flexible, and tintable urethane undercoating that offers professional-grade protection against impacts, abrasion, and environmental elements, while also dampening sound.
Expert Opinion: This Custom Coat kit is a fantastic value for a high-performance urethane coating. Its flexibility and resistance to chipping are standout features, making it ideal for the dynamic environment of a truck undercarriage.

8. Genuine GM Fluid 12378398 Rubberized Aerosol Undercoating

If you prefer to stick with genuine GM parts and fluids for your truck, this rubberized aerosol undercoating is a prime candidate. It’s formulated specifically for automotive use, providing an abrasion-resistant film with a medium to coarse texture. Beyond protecting against road debris and corrosion, it also acts as a good sound deadener, contributing to a quieter cabin experience in your GM truck.

Key features that stand out:
– Genuine GM Product: Ensures compatibility and quality for GM vehicles.
– Abrasion-Resistant Film: Strong protection against physical damage.
– Good Sound Deadener: Helps reduce unwanted road noise.

Pros:
– Trustworthy GM quality ensures reliable performance.
– Effective protection against road hazards and rust.
– Contributes to a more comfortable, quieter ride.
Cons:
– As an aerosol, coverage per can might be limited for larger applications.
Best for: GM truck owners seeking an authentic, easy-to-apply, rubberized undercoating solution for general rust and abrasion protection, with the added benefit of sound dampening.
Expert Opinion: For those who value OEM products, this genuine GM undercoating is a straightforward and effective option. Its dual function of protection and sound deadening makes it a practical choice.

9. Raptor Truck Bed Liner Kit with Colored GM White Tint (Anti-Fade Focus)

This Raptor Truck Bed Liner Kit, again with the GM White tint, is remarkable for its anti-fade properties. Its clever UV-protected formula is engineered to retain its color and vibrant tones, even after years of use and exposure to harsh elements. This is especially important if your undercoating will be visible or if you’re concerned about the integrity of the coating over time, ensuring it won’t ‘chalk’ or degrade prematurely.

Key features that stand out:
– Anti-Fade UV Protection: Maintains color and integrity in harsh sunlight.
– All-Climate Suitability: Won’t chalk when exposed to various weather conditions.
– Complete Kit: Includes tint, hardener, and spray gun for hassle-free application.

Pros:
– Guarantees long-term aesthetic and protective integrity in all climates.
– Resists fading and chalking, keeping the coating looking fresh.
– Comprehensive kit simplifies the entire application process.
Cons:
– Tinting, while beneficial, adds an extra step to the preparation process.
Best for: GM truck owners who need a highly durable, rust-resistant undercoating that will maintain its appearance and protective qualities for years, even under constant UV exposure and varying climates.
Expert Opinion: Longevity isn’t just about preventing rust; it’s also about the coating’s structural integrity. This Raptor kit’s superior UV resistance means it stays tough and effective, not just aesthetically pleasing, for much longer.

10. TCP Global Air Undercoating Spray Gun with Gauge

Another excellent tool for applying undercoating, the TCP Global Air Undercoating Spray Gun is a versatile pneumatic application gun designed for automotive rust proofing, undercoating, chip guard, and truck bed liner. Its standout feature is the 22″ flexible extension wand with a multi-directional nozzle, which makes applying rustproofing into the most challenging, hard-to-reach areas and inside hollow frames incredibly easy and effective.

Key features that stand out:
– 22″ Flexible Extension Wand: Essential for reaching deep into hollow frames and tight spots.
– Precision & Texture Control: Allows for applying different viscosity coatings and achieving various textures.
– Built-in Air Pressure Gauge: Provides precise control over air pressure for optimal atomization.

Pros:
– Exceptional reach with the long, flexible wand for thorough coverage.
– Offers excellent control over material flow and spray pattern.
– Durable aluminum construction with an easy-grip handle for comfortable use.
Cons:
– Does not fit all standard bottles (specifically Upol 1-liter bottles), so check compatibility.
Best for: Both professional auto body shops and DIY enthusiasts who need a reliable, precise spray gun with superior reach for thorough undercoating application on GM trucks.
Expert Opinion: This gun is a game-changer for interior frame rustproofing. The flexible wand is a critical asset, ensuring no hidden areas are left unprotected, which is vital for comprehensive undercarriage health.

Helpful Comparison Short Insights

When picking the best undercoating for GM trucks, you’ll notice a few distinct categories. For OEM-spec peace of mind, products like the ACDelco and Genuine GM Fluid aerosols offer reliable, manufacturer-approved protection that’s easy to apply. They’re excellent for maintenance or light protection.

If you’re after extreme durability and customization, the Raptor and Custom Coat urethane kits are your go-to. These multi-component systems provide a much thicker, tougher, and often tintable coating, making them ideal for serious off-roaders or trucks in harsh environments. They’re also great if you want to match your truck’s color or simply want a hard, textured finish that resists chips and abrasion far better than traditional rubberized sprays.

For those concerned about noise reduction, the 3M Rubberized Undercoating and the Genuine GM Fluid aerosol both boast sound-dampening properties, contributing to a quieter cabin experience.

Finally, remember that application tools matter as much as the product. For the thicker, more robust coatings, a dedicated spray gun kit like the Undercoating Spray Gun Kit or the TCP Global Air Undercoating Spray Gun is essential. These guns provide the necessary pressure and specialized nozzles, including those crucial extension wands, to ensure thorough and even coverage, especially in hard-to-reach areas of your GM truck’s frame and body. Don’t skimp on the tools if you’re going for a professional-grade finish.

Final Verdict

Choosing the best undercoating for GM trucks boils down to your specific needs, budget, and desired level of protection. If you’re looking for a quick, effective solution that adheres to GM’s standards and offers decent protection with sound dampening, the ACDelco or Genuine GM Fluid aerosols are fantastic, user-friendly options for basic maintenance. They’re great for patching up or light duty.

However, for those seeking maximum, long-term durability and comprehensive defense against rust, abrasions, and harsh chemicals, the Raptor Truck Bed Liner Kits (in their various emphasis on durability, versatility, or anti-fade) or the Custom Coat Urethane Undercoating are the undisputed champions. These multi-part urethane systems create an incredibly tough, often customizable barrier that will withstand years of abuse, making them ideal for serious truck owners who demand the absolute best protection for their GM.

And don’t forget the importance of proper application. If you’re investing in a heavy-duty undercoating, a specialized tool like the Undercoating Spray Gun Kit or the TCP Global Air Undercoating Spray Gun is indispensable for achieving thorough, professional-level coverage, especially in those tricky, hidden spots. Your GM truck deserves robust protection, and these options provide the tools and materials to achieve just that.

FAQ Section

Q1: Why is undercoating important for my GM truck?
A1: Undercoating is crucial for your GM truck because it forms a protective barrier against rust, corrosion, road salt, chemicals, and abrasive road debris. This significantly extends the life of your truck’s chassis, frame, and undercarriage components, preserving its structural integrity and resale value. It’s an investment in your truck’s longevity.

Q2: How often should I reapply undercoating to my GM truck?
A2: The frequency of reapplication for the best undercoating for GM trucks depends on the type of product used and your driving conditions. Thicker, professional-grade urethane coatings like Raptor or Custom Coat might last 5-10 years or more with proper application. Aerosol rubberized coatings might need inspection and touch-ups every 1-3 years, especially in harsh climates with heavy road salt. Regular inspection is key.

Q3: Can I apply undercoating myself, or should I hire a professional?
A3: Many undercoating products, especially aerosols, are designed for DIY application. However, for the best undercoating for GM trucks results with multi-part systems like the Raptor kits, professional application or a dedicated spray gun kit (like those reviewed) is highly recommended. Proper surface preparation (cleaning, degreasing, rust removal) is critical for any application, DIY or professional.

Q4: Is there a difference between rubberized and urethane undercoating for GM trucks?
A4: Yes, there’s a significant difference. Rubberized undercoating (e.g., ACDelco, 3M) is typically more flexible, offers good sound dampening, and is easier to apply with aerosol cans. It’s good for general protection. Urethane undercoating (e.g., Raptor, Custom Coat) is a much tougher, more durable, and often tintable 2-part system. It provides superior abrasion, impact, and chemical resistance, lasting significantly longer, making it arguably the best undercoating for GM trucks facing extreme conditions.

Q5: Will undercoating help reduce noise in my GM truck?
A5: Yes, many undercoating products, especially those with rubberized or thicker textured finishes, have sound-dampening properties. They can help absorb road noise and vibrations from the undercarriage, leading to a quieter and more comfortable ride inside your GM truck. Look for products that specifically mention “sound deadener” or “noise reducing” in their features.

Q6: What is the benefit of a “tintable” undercoating like Raptor for my GM truck?
A6: Tintable undercoating allows you to add a specific color pigment (like GM White) to the base coating. This is beneficial if you’re applying the undercoating to visible areas (like rocker panels or fender wells) and want it to seamlessly match your truck’s paint color. While not strictly necessary for non-visible undercarriage parts, it offers a cleaner, more integrated look if desired, and the inherent properties of the tintable base still offer the best undercoating for GM trucks protection.