CRC Knock’er Loose Penetrating Solvent 03020 – [Reddish] 13 WT. Oz., Industrial Grade Penetrating Solvent and Lubricant

I've used Kroil for many years after my father, who was an aviation mechanic, introduced it to me. It's the best penetrating oil I've used but it's very expensive. In the past, it was hard to get because you had to order it directly from the manufacturer but since they were bought out by another company, it's much easier to order it as a consumer.I was pleasantly surprised to find out that since Kroil's utility patent ran out, CRC came out with Knock er Loose which has the same formation as Kroil. I have not seen it available locally so it's not as cheap as the ones you can buy in the store but it's still 1/2 cost of Kroil. Recently I used this a couple of rusted screws that secures a burner on a gas stove. The first one I didn't use any penetrating oil and snapped the head off because I thought the screw was turning. The other one I doused it with Knock er Loose, waited a couple of minutes and then turned the screw back and forth until I got it to break free and move slightly. Once it starts moving, then you know your almost home free. Keep spraying it with penetrating oil every now and then and turn it back and forth until you feel resistance. Patience is key - don't think you can just unscrew it forcibly because it's loose. The resistance you feel is the rust caught in-between the threads so you need time to break that loose with the penetrating oil. Working the screw back and forth not only helps break up the rust but also helps the penetrating oil seep further down into the threads.

I sprayed some on a day in advance and the rusty crusties were no match

I have been a diesel mechanic for 23 years this product does not disappoint. Works great spray it on let it set usually works. Best penetrating spray I have come across in a long time. Highly recommend.

I refurb antiques, & a LOT of them have stuck screws, so I've always used WD-40 to get them out. Since many are still not loosened with that, even after multiple applications, I've been trying different brands recently.This CRC brand certainly smelled the best of the 3 brands I've tried. Since I work in a basement workshop, there's no good ventilation, & whatever I use, I'm stuck smelling it.Obviously, I don't sit around inhaling it any longer than I have to, but it does take a few minutes to spray all the parts, & then get out, so it can sit. I can only hold my breath so long, then I'm going to get the aroma, whether I'm done or not. (Geeze that Liquid Wrench is the WORST! I had to throw it out! Even in the Garage - It stunk us out!) WD smells like oil, LW stunk to high heaven, & this CRC smells kinda sweet - like candy. Not sure that's a good thing, but if you gotta inhale stinky stuff, may as well not make it horrid smelling. (Though there's a case to be made that if it stinks, you'll hurry up, & if not, you may dawdle. Hurry up, either way, & don't breathe the fumes any longer than you have to.) I always do my spraying on the way out at the end of the day, so it can sit overnight before I have to go back in.As to loosening the parts, I've tried it on 3 stuck screws that WD didn't loosen. It loosened 1, but not the other 2. Hard to say if it's better than WD, but it's probably no worse, & the smell is better. If smell outweighs the cost to you, go with the CRC. If cost matters more, I'd stick with the WD. Neither are magic, & both are better than breaking the screws.

So, picture this: My husband, the fearless shade tree mechanic, facing off against the stubborn starter bolts of his beloved Ford F150 pickup. These bolts, determined to defy his every effort, seemed to be mocking him with their unyielding grip. Enter stage left: CRC Knock’er Loose Penetrating Solvent 03020 – the trusty sidekick in his battle against rust and resistance!Let me tell you, folks, this stuff is like a superhero in a can. With a mere squirt, it swoops in to save the day, penetrating even the tightest of spaces with its industrial-grade might. As my husband affectionately calls it, this "reddish elixir of liberation" works miracles, loosening those stubborn bolts with a satisfying pop that signals victory!Now, I'm no stranger to the drama that unfolds in the garage when my husband is knee-deep in his DIY escapades. But let me tell you, CRC Knock’er Loose turned what could have been a comedy of errors into a triumph worthy of its own action movie sequel. With each bolt that surrendered to its powers, my husband's confidence soared higher than a superhero taking flight.And the best part? The humor! Oh, the laughter that ensued as my husband regaled me with tales of his epic battles with the bolts, complete with sound effects and dramatic reenactments. Who knew a can of penetrating oil could bring so much joy to our lives?So, to all the shade tree mechanics out there, I wholeheartedly recommend CRC Knock’er Loose Penetrating Solvent 03020. Whether you're facing off against starter bolts, rusty hinges, or any other stubborn foe, this superhero in a can is here to save the day – and provide a good laugh along the way!

I needed to remove my driver seat from my car. 2 of the bolts go through the floor and stick out under the car. They didn't want to come loose. I sprayed them with this stuff. A couple hours later they came loose with ease. highly recommend.

I had bolts holding the carburetor to the manifold on my 1949 Willys Overland Jeepster that I could not budge. Every other product didn't work. I tried this for a week, a quick spray and a tap each day and then, with virtually no effort the bolts came loose. I might even have been able to move them with my fingers. Amazing. Absolutely amazing. I have gotten other people to use it with the same results.

This works great! With this and a torch is was able to remove the header nuts from the engine on my 1993 Ford F250 and didn't break any! I highly recommend!