CRC 06026 Heavy Duty Corrosion Inhibitor, 10 Wt Oz - 4 PACK

We have two 10-year old vehicles (truck and SUV), which are currently driven throughout the winter in PA. Both were rust-proofed by the dealer when new and each has spent half those years down south and the rest up north. There is surface rust appearing on the edges and lap joints of some of the underside bracketry and frame rails, where the black OEM paint is degrading, but nothing serious. The dealer-treated areas are pristine and corrosion free. It's time to give the rusty areas some protection before the corrosion gets significantly worse. Once started, there's no stopping it! When I lived in the UK, I used a product called Waxoyl. It was very similar to this CRC product, being a waxy material suspended in a volatile petroleum-based liquid. Spray it on and let it spread and thicken through evaporation. It worked great in those wet and icy heavily-salted UK road conditions. I even applied it to the crankcase and gearbox of my motorcycle to stop the shiny aluminum corroding over the winter. When warm it flows and self-heals if wiped/scratched. Wiping it off with mineral spirits in Spring and the alloy shined up great! No abrasive polish required. During winter though, it did look like crap - filthy, with dirt and grime embedded in it! I hadn't seen such a product in the US until I saw the Project Farm video on YouTube, comparing rust prevention products. CRC came out on top and my own experience with a similar product confirmed this is the one I wanted. It seems to be good old Cosmoline, but in a spray can. I used 2 cans on each vehicle and that was just enough for my needs. If you are going to really cover the whole of the underside for total protection, you might need 6 or more cans for each. I lifted the SUV onto jack stands, but just crawled under the truck. As a fine mist is created, I wore a mask, hat, latex gloves, face shield and old clothes. You really don't want to breathe that stuff in (the mask was coated in a film of Cosmoline after I was done) and it'll coat anything in the mist. My garage floor is now a little sticky! I simply lay to one side and sprayed away from myself onto the rusty areas. There was no damp or dirt after recent rain, so I did no prep on the areas to be coated. One can did annoyingly leak a little from the aerosol button while spraying, but the others were just like using a spray paint can. Initially, the yellowy liquid will run and drip if you apply it too heavily, but in warm weather, it will start to stiffen fairly quickly and a second coat can be applied, if required. Heavy is better anyway. It'll leave a strong, but I think pleasant, Cosmoline odor in the garage until all the liquid has evaporated. That smell will take a few days to go, though the wax itself is pretty well "cured" after just a few hours. A dull, waxy film (yellow if noticeable - see attached photo) will be left to protect the metal. I have no doubt the CRC Corrosion Inhibitor will do its job and protect the vehicles from the rigors of the coming winter and likely into the following winter. The Amazon price of about $8 each for a box of 4 was the best "per can" price I found anywhere, available in just a couple days.

This is an order I used to rustproof a 2004 Chevrolet Colorado pickup truck. Used this same product on my 2022 Colorado truck. So far it seems really good, and after making an extended length wand - about 22 inches in length using another companies spray nozzle and taping it to a thick copper wire using blue painters tape - it worked really well. You must use Gum out Carb cleaner at the end of the day to clear this out of the nozzle and spray head so that it will not set up in the wand before you use it next. I used a 1/8 " drill bit in another manufacturer's spray nozzle that is used right at the can top of the CRC can(was from a FluidFilm can), and epoxied the brass end into the drilled nozzle using JB Weld epoxy. Works great and you don't even need an expensive spray gun . Word of advice - make two of these so you always have another one to go in case of any miss-haps. I'm still using my original nozzle/s and wand I fabricated - but had to re-epoxy the nozzle back in the original spray head after 1 and 1/2 mid sized trucks. It still works great. I use this product where I don't expect many rock chips, and the FluidFilm where I might see some road debris or rock chipping. Good product - I recommend it !

Bought a brand new Jeep Wrangler in 2020 which I intended to be used primarily for beach trips, fishing, offroading on sand, etc. The beach where I am at is all saltwater, so I definitely wanted an undercoating that would allow me to see if rust was developing as I read those rubberized type of coatings can hide corrosion developing from within. Once my lift was installed on the Jeep a few months later, I prepped the frame and parts by spraying with purple power and pressure washing underneath to have all parts clean, the Jeep was brand new so this did not take much effort. I had bought the four pack of CRC and crawled underneath and applied one coat (two cans) to the entire frame and inside, axles, bolts, suspension parts, etc. Only thing I didn't hit was the exhaust. Instructions said to apply one coat and let it cure for 10-12 hours. After the first coat I parked it in inside my garage and let it cure. Then applied a second coat the following day (two cans) and also let that cure for 10-12 hours. I did not drive it at all during the cure time. I did all this three years ago. Three years of constant road trips, beach trips, fishing trips, beach overnight camping trips all with exposure to saltwater spray and humidity. With the only upkeep I did was rinse the frame and under carriage with a pressure washer the following day depending on exposure to saltwater (driving in saltwater). Guess what NO RUST. I developed only small patina on the pinch welds of the frame which is common as the welding used is a different steel makeup. Other than that I have no rust on my vehicle. Also frequent pressure washing does not get this stuff off, you need to buy a special solvent that CRC sells to remove, this is a good thing as pressure washing helps to get rid of sand and unlike other products that stay tacky, they will either wash off every pressure wash or sand and dirt will cling to it, this product dries to a hard layer of wax where sand and water just slough off. After three years I could still feel that there was a light layer of the product still protecting the metal, it feels like thin wax and is invisible once it fully cures. I emailed CRC asking how long I could expect this product to last as an undercoating, they advised me two years. So I just recently bought another four pack and reapplied as of yesterday. Buy with confidence this stuff truly works as advertised. I wish I could buy it in a bigger container and some type of better spray nozzle for easier application but CRC does not offer this. Also know that when you first coat your Jeep it dries to a brownish amber color which hilariously looks like rust. It will smell and appear unsightly for the first week but once it fully cures the amber coating goes away and so does the smell. Very happy that this product is protecting my investment in an area that reduces vehicle lifespans to ten years.

By far the best choice for rust protection. I live in Toronto, On. Tried other products. This is by far the most effective for long term protection.

First saw this product by Scotty on YouTube. I did my car 5 years ago still no rust. Amazing product goes on like liquid wax. And it works. Don't even need to paint over and looks Amazing. If only it wasn't so expensive, you get what you pay for.

Used this product on the underside of my new cx5 while it was brand new and still clean. Sticks to undercarriage really well, no drips .went through a month of rainy weather, still as good as the day it was applied, unlike Krown rust I had applied in the past , it was completely gone after a few weeks! According to youtube videos it does not come off even with a pressure washer ! Seems to be one of the best for resisting rust !

Très bon produit,super efficace. Je l'utilise sur tout mes appareil de jardinage, le dessous de ma voiture etc et ca marche !

Short version: 1. It's amazing rust protection on cars. 2. It applies evenly and well, does not drip, does not make a mess. Cures into a light amber colour. Waxy finish that does not wash away easily. 3. The spray can itself is an odd design. The nozzle is a male fitting whereas literally every other spray can I have uses a female fitting. You cannot attach a straw or anything to the end of the nozzle, which makes reaching certain areas under the car a lot more challenging. The longer version: I bought this stuff after spending hours looking up reviews on the best quality product for undercoating a vehicle. I live in Ottawa, Ontario, and our roads are HEAVILY salted in the winter. Cars that don't get undercoated properly inevitably develop significant rust after a few years. We recently bought a new hybrid vehicle and several shops as well as the dealership recommended against the typical method of drilling holes in certain areas of the body and spraying petroleum based undercoating (e.g. Krown) as it may interfere with the high voltage wiring and cause issues. I was tied between using this CRC Marine product, or Fluid Film. This stuff appears to hold up better to being sprayed by water (a video of someone trying to pressure wash it off showed it had no effect). Whereas Fluid Film does a great job of protecting the metal, it does wash away much easier and needs more frequent applications. I'm all about saving time, so I opted for CRC Marine. It's also used specifically to protect electrical terminals on boats from corrosion caused by saltwater. If it works safely for that, surely it's fine to use on my hybrid. The product applies easily and adheres to the metal surfaces very well. It does not drip at all as long as you don't excessively over-spray in one area. Do several light-medium coats. The product cures pretty fast so you don't have to wait more than a few minutes between coats. The nozzle design is less than ideal for applying the product in confined/hard to reach places. The nozzle has a male end to it and cannot accept a plastic straw or any kind of extension. It also cannot be swapped out with most other spray can nozzles because the fitting is opposite to most other cans (male vs female). If they changed this design, it would make life a lot easier to apply the product. It remains to be seen whether this stuff will degrade any of the plastics/rubber under the car. The company's own website states that, while they have not seen CRC Marine cause any noticeable plastic/rubber degradation, they do advise to avoid spraying it on those surfaces just in case, as it's meant only to protect metal. Lastly, absolutely wear a respirator and eye protection when applying this stuff. It smells very strong and is not something you want to breathe in or get in your eyes.