KRUD KUTTER MR32 The Must For Rust, 32-Ounce Trigger Spray

This stuff is pretty awesome (if used properly)! it literally dissolves away rust. It may take a few applications of this spray along with some scrubbing and washing but it does definitely work. The problem: If many people are anything like my roommates, they assume that this spray is just magic and will make a super rusted old car look brand new. It's not magic. That doesn't mean that you can't remove a lot of rust from something, It just removes rust little by little over a period of time and possibly several applications. So far I've used this stuff to de-rust some of my car parts (just spraying it under my car every 15-20 minutes several times), bike parts, metal light switch covers, tools and as shown in the photos attached, some cabinet hinges, shower head and other metal parts in my bathrooms (and many other metal parts). Unfortunately I didn't take before and after photos of everything I've de-rusted but these hinges and the shower head only got a single application and this is what they looked like ~15-20 minutes later. Like I said, it definitely works. If you've got something that's VERY rusted, you might want to get the gallon container of this and put it in a bucket (along with your rusted part) to let it soak. I've also dumped it into my ultrasonic cleaner and that works REALLY well. Removes every bit of rust. If you can't submerge the part, then just give it several applications of this stuff, keeping the part wet for the most part. And then scrub and clean it in between to see its progress. I should also mention that I've now gone through at least 5 different "rust-removing" agents and none of them (besides straight up acid [which is dangerous]) have done as good a job as this stuff. Only downside is probably the smell. Spray it in a well-ventilated area if possible and after you remove the rust, rinse it, try it with a towel, give it an hour to dry the rest of the way and then coat it in something like "Sta-Bil rust prevention spray or something (if possible) to keep it from getting rusty again. Bottom line: It's my new favorite rust removing chemical! Love this stuff :)

I bought this to clean two steel hollow rods used on a radio antenna system. The Antenna was bought second hand and while 90% of it was aluminum those two 10 ft rods were steel and had been left outdoors on the ground for 5 years. Yep they were completely rusted and flaking. Taking them out to the driveway I wire brushed off all the flaking rust and then applied the Krud Kutter. The problem with doing large parts is that you cannot soak them in a container so you have to just spray them then let it sit for 30 minutes and then spray them again because the Krud Kutter will dry out. After 4 applications with an in between wash after the first two and then a final hosing off I had clocked about three hours working on them. The end result was at first a mixed bag of very clean shiny galvanized metal and patchy areas of darkened metal. On closer examination I realized it was not rust but just a left over stains that might come out with more soaking time. I decided instead to just use some 250 grit sand paper and rub it down lightly for 5 minutes. The once completely rusted surface was now 90% smooth and was left with just some small 1mm round pock marks on 10% of the surface from deep rust penetration. After cleaning off the rods with pure Alcohol I quickly sprayed the surface with cold Zinc spray. You really need to put something on the surface fast because if you leave exposed you can see a light powdery rust layer forming within minutes. After the cold zinc was sprayed and it dried I was shocked that I could clearly see the part numbers stamped into the metal, they looked as clear as if it was new! These were not even remotely visible before the treatment and I am pretty sure if I had used a hard sander they would have been rubbed out along with a lot of the surface steel. After giving the cold Zinc 48 hours to cure I used an epoxy paint that would hold to the cold Zinc Primer. The end result was almost a factory look as the paint filled out any tiny pits that were remaining. I am very happy with this product, it does what it says it will do and is better than any rust removal chemical I have used before. It does not eat at the metal, only the rust.

I used this on the frame of a 1960 Ford F100 Panel Truck and it had a lot of rust, not quite pitted on the entire frame but in a few areas. As well as on the undercarriage of the body. The trick is to keep the surface you are treating wet with the Krud Kutter. It is a phosphoric acid-based solution so if it evaporates, it will lose its effectiveness and stop working. The "white" that some people are complaining about is actually product of the neutralized rust which has been partially converted. Technically speaking, phosphoric acid isn't as much dissolving the rust as it is converting it. It causes a reaction and turns iron oxide (the rust) into iron phosphate which is very hard and stable and reduces the chance of further rust forming. The dreaded white residue is a crystalline structure that bonds to the metal, the good news is that it also inhibits rust from forming again, the bad news is that paint doesn't like to stick to it. The residue often appears when either the phosphoric acid is rinsed with water before it has completely converted all of the iron oxide to iron phosphate and exposure to air causes the very hard crystal structure to form and molecularly bond to the metal, or it can also happen if the phosphoric acid solution evaporates before all of the iron oxide has been converted. There are a couple of solutions to get rid of the white residue: 1) if it is appearing within minutes or a few hours of applying the phosphoric acid solution, you can typically apply more of the solution (make sure it stays wet with the solution) and it will dissolve the white while continuing to convert the remaining iron oxide to iron phosphate. 2) if the white crystal residue has been on the surface for days or weeks, then the best solution is removing it mechanically (e.g. wire wheel, steel wool, wire brush, flap disc, etc.), which will remove it but you will be exposing the raw metal again and it will likely flash rust within a day or two if there is any humidity in the air so be prepared to coat it with something (yes, more phosphoric acid solution/Krud Cutter will work and once all of the iron oxide is gone and the surface has remained wet with the phosphoric acid solution, the white _should_ not come back. YMMV, but I have used this many, many times on 20 to 30-year old rust with no trouble. Just keep it wet with the solution until all of the rust is gone.

The notion of spraying this liquid on something to de-rust it is largely ludicrous. It is so watery it won't actually cover the item as a thin film, but rather forms little droplets of de-rusting chemical, so those little circles where the drops are will benefit, but the rest of the item will get no treatment. I found the only realistic way to use this is to pour it into another container and immerse the item to be de-rusted in that. This doesn't work super fast, & I find 10 minutes at a minimum are needed. After that, you'll need to buff off the light coating of dark oxide that remains on the de-rusted item (I use a finishing pad. You'll then have a nice, shiny, de-rusted item. This product is made by Rust-oleum, & they have another product that squirts out as a gel and that is REALLY good at staying put and de-rusting. You can even trowel it around with something, spreading it where you want it in case the spray wasn't uniform.

This product was invented by a man who lived close to me. I was turned on to it by a co-worker...we were both drives for the major shipping company...not USPS OR FEDEX...He picked up the product...the man died and his son took over...the product was named The Must for Rust...we found out it was sold...but i found it...and this is the product. Not only does it take the rust off anything...and this is not a lie...this stuff works...forget the product CLR does not hold a candle to this product!!!!!...it take off mineral build up on old windows..and plumbing where water minerals have corroded....i was so happy to find this product after years of using it...and then losing it...I am so glad to have the use of this unbelievable product again!

This product does not remove rust any better than cheap cola. It left a white mess on rusted surfaces on an old garden shovel. I would be happy if this product even mimicked the numerous rust converters on the market that leave a black appearance on treated surfaces. Used it on an old clogged shower head and it did not work. Wasted my time and money. June update: I used this smelly product on the rust stains in an old toilet tank, it took 3 applications over a 5 hour period with rinsing/scrubbing with a toilet brush between applications and finally it worked, not real fast but it certainly got rid of all the rust stains. I guess this product is more effective when rinsed and scrubbed than a stand alone rust remover.

My rotors and calibers started rusting a few weeks ago. I sprayed this directly on the rotors and calibers (while the wheels are still on my car). I sprayed it in the morning, went in to work for 8 hrs and when I left work most of the rush was gone, there was white residue left but I'm sure that will rinse off when I spray it down with a hose. No white residue on my rims/wheels though which is impressive. I'm guessing the white residue is what's caused when the rust is broken down. Since the rotors rotate with the wheels, When I drove again I was able to spray the bottom half of the rotor (cause now they're on top if that makes sense.lol). Anyway now all the rust is gone.

I tired everything to get the rust marks off my azek decking, nothing worked until this. Was super easy to use and took a ton of years old rust off my white azek boards.

I have been searching for rust remover and inhibitor for a long time and ended up buying many useless products. However this Krud Kutter rust remover works better than I had ever expected. I would strongly recommend this product to anyone who is genuinely looking to get rid of the rust issues, once and for all.

Amazeing product. cleans off rust/ oxidation. old rusted tools can be jus left soked overnight and they would be rust free. Difficult to use on painted / chrome plated objects which are rusted.

I used this to remove rust from stainless steel water taps and shower. It removed rust but taps rusted again within 15 days.

Excellent product. Removes surface rust easily. Used it to clean the motorcycle tank kept the chemical for 30 mins all the rust was gone. Tank should be dried immediately with industrial hot air gun so the flash rust doesnt appear.

Good product. Removes rust easily but does not work on dated rust.