Do newer cars need rustproofing?

Generally no—new cars built in the last decade rely on factory protections that make aftermarket rustproofing unnecessary for most owners.

Factories use galvanization, epoxy coatings, and corrosion warranties; in very salty or coastal climates, or for vehicles expected to endure heavy winter exposure, some buyers still consider additional underbody protection, but results vary and proper application matters.

What protects modern cars from rust

Modern vehicles integrate several layers of protection to resist rust, spanning materials, coatings, and warranties. The key protections are summarized below.

Materials and coatings

Body panels frequently use galvanized steel or aluminum in some models to resist corrosion. In addition, manufacturers apply electrocoat (e-coat) primers and multi-layer topcoats with sealants to protect exposed metal surfaces from moisture and road chemicals.

Underbody protection and drainage

Many cars receive underbody sealants or wax-based coatings in regions with heavy road salt. Vehicles also feature drain paths and sealed joints designed to minimize moisture buildup in vulnerable spots.

Corrosion warranties

Most automakers offer a corrosion-related warranty covering rust perforation for a set period (often several years to a decade, or longer in some markets). Warranty terms vary by brand and model, so owners should check their manual or dealer literature.

Bottom line: factory materials, coatings, and warranties provide substantial rust protection for most drivers, reducing the need for aftermarket rustproofing.

Do you still need rustproofing?

Whether you should pursue rustproofing depends on climate, driving conditions, and how long you plan to keep the vehicle. The following options are commonly considered, with notes on suitability.

• Spray-on undercoatings (rubberized or wax-based):


• Pros: Can add a protective layer on the undercarriage; may help in areas with heavy road salt.


• Cons: Can trap moisture if applied poorly; may interfere with inspections or repairs; potential warranty considerations; effectiveness varies by product and installation quality.


• Cavity wax or internal frame protection (professionally applied):


• Pros: Targets hidden areas, pins, and cavities where rust starts.


• Cons: Mostly complements factory protection; coverage is limited to specific areas and requires periodic reapplication.


• Factory- or dealer-approved corrosion protection services:


• Pros: Designed to work with a vehicle’s warranty and coatings; performed by trained technicians.


• Cons: Adds cost; results depend on proper product selection and application.


• DIY rust inhibitors and basic coatings:


• Pros: Lower upfront cost; can address small areas of concern.


• Cons: Risk of incorrect application or damage to seals; less effective than professionally applied products; may void certain warranties if not approved.

In summary, for drivers in mild climates with regular maintenance, factory protection is usually sufficient. In harsh climates—especially areas with heavy salting in winter, coastal humidity, or frequent exposure to road grit—some people opt for additional protection, but it’s not a universal requirement and should be chosen carefully with warranty implications in mind.

Maintenance tips to minimize rust risk

Regular maintenance can significantly reduce rust risk regardless of whether you add aftermarket protection. The following practices are commonly recommended by manufacturers and automotive experts.

• Keep the undercarriage clean, especially after winter and on roads treated with salt or chemicals.


• Rinse out wheel wells and lower panels where mud and moisture can accumulate.


• Inspect the underbody for chips, scratches, or damaged coatings and repair promptly to prevent moisture intrusion.


• Ensure drainage holes remain clear so water doesn’t pool in hidden pockets.


• Follow the vehicle’s warranty guidance on corrosion protection; don’t overlook coverage for perforation or coating failures.

Summary

Most new cars are adequately protected by factory materials, coatings, and corrosion warranties. Rustproofing is generally unnecessary for many owners, but those in harsh climates may consider targeted protection after weighing product quality, warranty implications, and cost. Regular maintenance—especially under the car and in exposed areas—remains a practical, low-risk strategy to minimize rust risk.

Do you need rust protection on a new car?

It doesn't matter how many miles are on your vehicle when it comes to protecting it from rust. If you want to keep your vehicle around for longer, or just want to preserve its value, undercoating is important.

Is it worth getting protective coating on a new car?

Yes, paint protection is worth it for a new car, especially if you plan to keep it long-term, as it can protect the paint from damage, make maintenance easier, and boost resale value. Options range from traditional waxes to professional-grade ceramic coatings and paint protection film (PPF), with the best choice depending on your budget and the level of protection desired. While dealer-offered protection is often overpriced, professional services from a reputable shop or DIY options like wax can be effective. 
This video explains what is paint protection film and how it protects your car: 54sBlackout TintingYouTube · Jun 3, 2025
Benefits of paint protection

• Protection from damage: It guards against fading, chipping, scratches, and swirl marks from debris and environmental contaminants.
• Easier cleaning: Protective coatings repel dirt, water, and grime, which simplifies the washing process and helps keep the car looking new.
• Higher resale value: A well-protected car will maintain its appearance and condition, leading to a better resale price when you eventually sell it. 

This video discusses the pros and cons of paint protection film: 1mBlackout TintingYouTube · Nov 12, 2024
Factors to consider

• Budget: The cost varies significantly. PPF can be expensive, while waxes are a budget-friendly option. Consider the long-term value for the cost. 
• Car usage: If your car is a daily driver that is frequently exposed to harsh road conditions, more durable protection like PPF may be a worthwhile investment. 
• Longevity: If you plan to keep the car for many years, the long-term benefits of a high-quality protection system will outweigh the initial cost. 
• Professional vs. DIY: Professional installation ensures a flawless, durable finish, while DIY options like waxing can save money but require more effort and knowledge. 
• Dealer vs. independent shop: Many experts advise against buying protection packages from dealerships, as they are often overpriced and can be purchased for less from independent detailers or even applied yourself. 

This video explains how to choose the right type of paint protection for your car: 37sHumble Crew Auto SpaYouTube · May 5, 2025

Do modern cars have rust protection?

Modern paints contain chemical additives (sometimes referred to as rust preventives) that create an invisible shield against moisture. Anti-corrosion waxes are also applied to protect vulnerable areas of rims or other parts.

Is it worth undercoating a new car?

No, undercoating is generally not worth it on a new car because they are already manufactured with significant rust protection. Automakers use advanced techniques like zinc-based paint and sealants on new vehicles, making additional undercoating unnecessary and potentially even counterproductive. 
This video explains why you should not waste your money on undercoating for new cars: 37sScotty KilmerYouTube · Sep 12, 2024
Why new cars don't need undercoating

• Built-in protection: New vehicles are manufactured with rust-proofing, such as electrostatically applied zinc-based paint that even coats internal frame cavities. 
• Automaker's methods: Companies use methods like PVC sealants in seams and a "stone guard" sealant on the underside to prevent rust, according to MotorBiscuit. 
• Potential for damage: Applying an aftermarket undercoat can clog drainage holes in the car's frame, which can trap moisture and lead to rust. 
• Warranty issues: Adding an undercoat, especially one applied by a dealership, may void the manufacturer's rust resistance warranty. 
• Unnecessary cost: Consumer Reports advises against the added expense of undercoating on new cars, along with other add-ons like VIN etching and fabric protection, as they are not needed for rust protection. 

When undercoating might be considered

• Older vehicles: Undercoating is more beneficial for used cars that are already showing signs of rust or are in areas with heavy road salt use. 
• After several years: Some suggest a professional rust protection treatment every few years, particularly before the first winter, can be a good idea once the factory protection begins to wear off. 
• Environmental factors: If you live in a harsh, salty, or wet climate and plan to keep the car for a very long time, a professional oil-based undercoating applied by a specialized dealer might be considered down the line. 

This video discusses the importance of rust protection for cars in harsh winter conditions: 43sCar Help CornerYouTube · Oct 31, 2021