Best Undercoatings of 2026

"I've used this undercoating for years and have found it to provide excellent protection against rust and road salt. The spray is consistent, and the coating holds up well except in spots where rocks hit. No issues with clogged nozzles—just be sure to use it somewhere with good airflow because it does have a strong smell."

"I live near the coast in Oregon where the salt air can really damage vehicles. This product was easy to apply right out of the can and has worked great on my car's undercarriage. No need for a compressor, and the finish looks very durable. I’ll definitely buy it again."

"I bought this to protect my car from all the road salts used in the northeast. The spray application was quick and simple—just remember to wear a mask. Plus, it’s cheaper than what local stores charge. Highly recommend for anyone wanting to shield their vehicle."

"After cleaning and converting the rust on my 2015 Jeep Wrangler’s undercarriage, I used this rubberized undercoating spray for extra protection. It went on easily, gave a matte black finish, and made the metal parts look refreshed. I recommend wearing a mask and gloves during application. Two cans covered most of my undercarriage, but a third would have helped for complete coverage. Great quality for undercarriage use—I even used it to touch up some outdoor metal items."

"I've restored many classic cars, and this undercoating provides the best value for money. The adhesion is strong (almost as good as 3M but cheaper), and surface prep is straightforward—just clean, degrease, and dry first. I use a primer before applying this to ensure durability. Protects against rust and grime and gives my classics a great look underneath. Just avoid using it on certain components like the engine, suspension, and brakes. Overall, it's an excellent product for preserving older vehicles."

"I used this on my 66 Charger, and the spray goes on thick with great adhesion. For each wheel arch, I needed about two cans, so be prepared to use a fair amount. The coverage and end result looked factory-fresh with no runs or drips. The fumes are strong, so a mask is a must, but I’m very satisfied and will be ordering more for the rest of the car. Solid company and quality product."

"I live in upstate NY and have to refresh this undercoating every year, but it’s really easy to apply and adheres evenly. My 2016 RAM still has no rust at all, so I know it works."

"I first used this product on my Jeep right after I bought it from the dealer nine years ago, and when I sold it, there was absolutely zero rust. I’ve just bought a new 4-Runner and immediately undercoated it with this brand again—it outperforms Zbart in my experience."

"I bought this for the wheel wells I couldn’t soundproof directly. The rubberized layer works well, but you do need to allow curing time and make sure to cover areas you don’t want coated."

"I found the coverage to be outstanding, especially with the long nozzle that made getting into hard-to-reach frame sections much easier. The 360-degree spray really gets the product into every crevice. Just make sure to wear protective gear and tape off frame holes—it can get messy if you’re not careful. I’d definitely recommend this for anyone seeking an internal frame solution."

"The extended spray tube made application simple in tight places, but I did notice that the nozzle can clog if you’re not careful. Also, if you leave product in the can for later, the tip might harden up. Next time I’ll use the whole can at once. That said, the final result looks great!"

"I’ve used a lot of Eastwood products and the frame coating works well, but the hose it comes with is a bit flimsy. It reminds me of a WD-40 can, and I wish it were sturdier. Still, it’s the best solution I’ve found for enclosed spots on my truck’s frame."

"I've tried a lot of tire products and this one stands out for its easy application and clean look. I like that it doesn't leave a greasy feel and the tires stay looking fresh for weeks. If you want that super shiny effect, just leave it on, but I usually prefer to wipe it down for a more natural finish. Outperforms other brands I've used."

"I've purchased this in bulk to save money because it really works well and is easy to use. However, I did have a couple of cans where the spray nozzle wasn't working, which was a bit disappointing. When it sprays, though, the results are definitely worth it."

"I use this spray for both my tires and interior plastics. It's great for adding a finishing touch to my detailing routine and doesn't attract as much dirt as other brands. The shine lasts a good while and keeps everything looking new."

"This has become my absolute favorite for all my car projects—easy to use, affordable, and covers well! Honestly, I could always use more. As shown in my photo, I only needed half a can for solid coverage. Highly recommend for DIY automotive work."

"The kit performed even better than I expected! Sprayed smoothly and provided excellent protection for my classic VW chassis. The only minor downside is that some product stays in the can and can’t be reused, but overall, application was simple and the results were worth it."

"I strongly suggest this product for anyone restoring a vehicle. It bonds extremely well, doesn’t chip, and dries quickly. I picked up an extra gallon for maximum protection on my old Chevy frame, and it’s held up great so far. Saved me a ton compared to professional services!"

"The coverage in the frame was excellent, and I’m very happy with how thoroughly it coated everything."

"I used this product on my 2003 Jeep Wrangler for peace of mind against rust. I went through three cans to make sure I got it well coated. Now the frame is still rust free and I'm confident it will stay that way."

"The application is a bit messier than I expected from the videos, but the product definitely works well once applied."

"I've tried a few other coatings, and I have to say, this one really stands out for rust prevention. It goes on evenly, even in tight spots, and dries to a durable, flexible layer. The best part is it doesn’t leave a sticky mess like some others do, so my mechanic is happy too."

"After stripping and repainting my S10’s frame, I used this coating inside the rails. It holds up way better than WD40, even after brake cleaner and hours of testing. No rust at all through salt-heavy winters, and it doesn’t attract grime. Just remember, let your paint cure first before applying."

"I’ve been using this in my bodyshop for years, and the quality is outstanding for the price. It’s easy to apply, creeps into small areas, and provides real peace of mind against rust. Highly recommend it!"

"I found this product very easy to apply on the rear fender wells of my 2023 Silverado. It seems quite durable, and with careful masking, the job was straightforward."

"I used one can to cover both rear fender wells on my 2024 F150 with a light coat before installing plastic liners. The spray nozzle is ideal for tight spaces. For full protection, I'd suggest a can per wheel well."

"I coated the underside of my Nissan Rogue and Frontier with this product, and it works as a great corrosion inhibitor. If you plan to keep your vehicle for a long time, I highly recommend it!"

"I tried this spray and found it has a nice, paint-like texture and is easy to apply. The color is more of a dark charcoal than pure black. I’m interested to see how it holds up over time, especially since the price is fair but not exactly cheap."

"I used this product to seal the undercarriage of my 2017 Kia Soul and was impressed by the coating quality. The material exceeded my expectations, and I’m happy with how it turned out."

"The spray went on smoothly and effortlessly, and I didn’t have any issues with the nozzle clogging during application."