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#4372943 - 04/06/17 06:25 AM Re: Penetrating Oils [Re: dlundblad]
Buhwheat Offline


Registered: 03/12/17
Posts: 80
Loc: Vernon, CT
Originally Posted By: dlundblad
Rather than hijacking the other penetrating oil thread, I'll just start fresh.

I've always used PB Blaster and it visually doesn't look oily a day or so after application. At that rate, I am not sure if it's actively penetrating anymore.

I've always had decent luck with PB Blaster, but is there anything out there that's better? I also wonder if mixing ATF at a ~25% ratio would help allow the penetrating oil to stay on the parts longer.


You are correct, mixing ATF and Acetone 50/50 does amazing things with a stubborn bolt. Better than anything bought. Some come close. And no special shipping requirements, like with Kano Labs AeroKroil.

That said, I shoot it with PB first. It usually works, too... Patience of heat and a short time to let the pene lube work usually does the job. That, and leverage on the bolt with a good grip. Mixing ATF and Acetone is annoying, even with my repurposed spray bottle (of Rain-X, used all the Rain-X.)

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#4375717 - 04/09/17 08:05 PM Re: Penetrating Oils [Re: dlundblad]
dlundblad Offline


Registered: 09/30/13
Posts: 9153
Loc: Midwest
I had a chance to use some Liquid Wrench this weekend, BUT it was on areas that has previously be sprayed with PB Blaster a week and 2 weeks prior. As I said in my OP, my biggest complaint with the stuff is that it seems to evaporate off so who knows if the stuff was doing anything?

The bleeder screws on my truck looked pretty sad.. I was worried the rears were going to snap off inside the wheel cylinders. Everything came apart issue free. In the past, PB Blaster seemed to get the job done, but I always felt excessive friction when backing out the fastener. These were super smooth and I actually felt guilty about pitching "good" parts.

I also did my front shocks and had no worries about reusing the original bolts.
_________________________
03 Jeep WJ 4.0 197k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 170k M1 0w40 Mann HU818X
97 Chevy Blazer 4.3 138k Synpower 5w30 Fram TG3980


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#4375858 - 04/10/17 02:11 AM Re: Penetrating Oils [Re: dlundblad]
Superflop Offline


Registered: 07/01/09
Posts: 369
Loc: Seattle
One thing to mention is that taking a wire brush to the areas first before spraying penetrant makes a huge difference.
_________________________
2002 saab 9-5 2.3t wagon
2014 dodge grand caravan magnatec 5w-20

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#4375872 - 04/10/17 04:40 AM Re: Penetrating Oils [Re: dlundblad]
dlundblad Offline


Registered: 09/30/13
Posts: 9153
Loc: Midwest
Originally Posted By: Superflop
One thing to mention is that taking a wire brush to the areas first before spraying penetrant makes a huge difference.


Makes sense.

The less rust to work through, the better.


Edited by dlundblad (04/10/17 04:40 AM)
_________________________
03 Jeep WJ 4.0 197k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 170k M1 0w40 Mann HU818X
97 Chevy Blazer 4.3 138k Synpower 5w30 Fram TG3980


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#4550806 - 10/22/17 08:50 AM Re: Penetrating Oils [Re: Trav]
Smoqueed Offline


Registered: 12/24/16
Posts: 72
Loc: Indiana, USA
Originally Posted By: Trav
Kroil, Liquid Wrench and CRC Freeze-Off are the ones I have had the best luck with. On studs like pipe to manifold I use a hand held hydraulic nut splitter if possible but if not heat the nut cherry red then hit the stud with blast it canned air turned upside down then immediately shoot it with penetrant.

https://www.contorion.de/handwerkzeug/gedore-mutternsprenger-hydraulisch-sw-7-22-m4-m14-210411368


Blasting a bolt with the propane torch then immediately hitting it with Freeze-off does a great job. It's [censored] near a requirement if you ever need to replace a wheel cylinder in the rust belt and don't want to absolutely destroy the brake line.

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#4551004 - 10/22/17 12:26 PM Re: Penetrating Oils [Re: dlundblad]
Oro_O Offline


Registered: 09/20/14
Posts: 1316
Loc: Seattle-ish, WA
Originally Posted By: dlundblad


I've always had decent luck with PB Blaster, but is there anything out there that's better? I also wonder if mixing ATF at a ~25% ratio would help allow the penetrating oil to stay on the parts longer.


Yes, there is. In order, 1) Kroil and 2) Liquid Wrench 3) probably a host of others.

I did a test several years ago when restoring a neglected older Honda motorycle, and I had all three in the garage. I had about a dozen chassis bolts that were equally exposed to the elements. I soaked two each with Kroil, PB, and Liquid Wrench. I left them overnight and then tested how easily they broke free. I don't recall the torque values, but the pair that were Kroil'd were substantially easier than the pair that were soaked with Liquid Wrench, and the pair with PB substantially behind that. It was not a thoroughly scientific test, but it was consistent with my past experience. Since then (~c. 2005), I have stuck with Kroil with no regrets.

I know lots of people get good results with acetone + ATF. I've tried it and didn't find it better than kroil, and it didn't seem to penetrate as well. It also constantly separates and is difficult to apply in a lot of situations since it isn't in an aerosol container. I love home-brew solutions and if I needed a large amount of something I could just pour on instead of needing to shoot in various angles and tight/blind places, I'd likely use it.

Last month I picked up some Free All because it was basically free w/a coupon at O'Reillys. It has some great reviews and I'll give it a real work out on some rusty undercarriage work on an older car this winter. it's much more available and cheaper than Kroil and if it proves 95% as good, I will probably switch to it. This stuff:

http://www.freealloil.com/

https://www.amazon.com/Gasoila-Free-Rust-Eater-Penetrating/dp/B00CRKVNSE#customerReviews

Anyone use it?

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#4632103 - 01/12/18 05:08 AM Re: Penetrating Oils [Re: dlundblad]
NSG Offline


Registered: 03/24/14
Posts: 12
Loc: Virginia
I love Kroil.

Before seeing the light on spraying rusty bolts I would just sheer them off and be frustrated with the mess left...

Someone on the garage forum mentioned Kroil. This was several years ago. From that point on it's the ONLY thing I use for bolts. It works. Actually in the process of spraying my Ranger's bed bolts. I got 4 out of the 6 out. The front two were on there so rather than stripping the t55 torx bolt I have been spraying them with Kroil 3 times a day for about a week. Today when I get my new t55 bit, I will attempt to remove them and hope all is well with no stripped bolt or sheered bolt...lol

The smell of it is wonderful as well. Some people can't stand the smell...lol

-Nigel
_________________________
~NSG~

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#4636280 - 01/16/18 01:20 AM Re: Penetrating Oils [Re: dlundblad]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 260
Loc: Alberta
The Aussies have a product called Nuts Off. An Aussie mechanic I know swears by it.

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#4636284 - 01/16/18 01:31 AM Re: Penetrating Oils [Re: dlundblad]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 260
Loc: Alberta
Also consider CRC Freeze-off if you’re not having any luck. Check their video.

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