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PostPosted: Mon Jun 11, 2018 11:36 am 
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Last week I decided to try 'WD-40 Specialist Fast Release Penetrant' for the first time. It was on a steel M12 bolt which was corroded into an unthreaded alloy bush (the bush was cast into a rubber mounting, so couldn't be heated much).

The parts were soaked for five days, but sadly still nothing giving. So I drilled out the bolt this morning, and discovered the penetrant had barely soaked any way into the corrosion, which remained dry and powdery just below the surface. From the description ('Quickly penetrates rusted and corroded parts, Loosens seized fixings, For use on metal, alloys, rubber & plastic'), I had hoped for more. Hopefully it means at least the rubber shouldn't have been affected, though.

So in this application it didn't work for me. But I've part of the can left, has anyone found types of corrosion etc. that it works well on?

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PostPosted: Mon Jun 11, 2018 1:32 pm 
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I use plus gas and never had any bother. But it will only creep so far if a physical block.
Soak and try and undo a little might allow more ingress


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PostPosted: Mon Jun 11, 2018 1:47 pm 
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All the stuff I've tried over the years has only limited penetration on really gunged up solid stuff.
Soak it, then try to move it a bit. Once it moves a bit the oil will get in there.


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PostPosted: Mon Jun 11, 2018 3:15 pm 
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Yeah, I was probably hoping for too much from the stuff, but am disappointed that it did 'so' little, after the claims given on the tin. Had it helped even a bit then that could have been enough to get a start. As it was, plus-gas would have been no less effective, and could have been better.

Still, the drill worked so no worries. One day I may learn to distrust wonder liquids :lol:

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PostPosted: Mon Jun 11, 2018 3:25 pm 
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sounds like a car wish bone

GT85 or plus gas are my go to, gun oil works very well to but isn't cheap, I oiled the padlock on our back gate 3-4 years ago it only gets opened once in a blue moon and it still open freely

eg.

https://www.ebay.co.uk/itm/Parker-Hale- ... gUkc_4J-DQ


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PostPosted: Mon Jun 11, 2018 4:32 pm 
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Thanks, I'd not come across the gun oil before, so thats good to know. I have used plus gas quite often and it usually does at least something, though I didn't try it here so can't really make a fair comparison.

I posted this on the general forum since the penetrant itself is sold for many purposes, but yes the part was car related (a mounting on a rear differential). The corrosion and rust wasn't actually very bad, but the bolt & bush was a couple of inches deep, so a lot of area - reasonable penetration would have been needed to do anything of use. As it were.

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PostPosted: Mon Jun 11, 2018 5:33 pm 
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I got a free tin to try last month and I’d say the normal wd40 is better!

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PostPosted: Mon Jun 11, 2018 7:18 pm 
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Heh, I see, thanks. The original WD-40 is okay as a thin oil, but I wouldn't have said it was a proper penetrant, so that puts things in perspective.

Now you come to mention it, the 'specialist' wd-40 penetrant doesn't seem especially thin, either. To be fair, it does readily seep through dirt and up paper towels etc. but probably thinner liquids would be needed to permeate the corrosion in this case, or possibly dissolving it with acid or similar could have been better.

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PostPosted: Mon Jun 11, 2018 10:31 pm 
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I don't p*ss about with any of this stuff any more. If it doesn't move with a breaker bar then I might try heat. Then the angle grinder or drill come out :lol: . Spent hours over the years waiting for penetrating fluid to"soak in" and little turns back and forth to free it off. Waste of time.


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PostPosted: Tue Jun 12, 2018 7:53 am 
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Snake oil most of it.


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PostPosted: Tue Jun 12, 2018 10:13 am 
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I've bought any number of special liquids over the years for a range of purposes, which have claimed much but delivered little. I kind of expect that by now, and yet.. there always seems the possibility that a new product may properly do what it says.. :roll:

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PostPosted: Tue Jun 12, 2018 12:24 pm 
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Coca cola is worth a try

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PostPosted: Tue Jun 12, 2018 1:57 pm 
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columbiers wrote:
I don't p*ss about with any of this stuff any more. If it doesn't move with a breaker bar then I might try heat. Then the angle grinder or drill come out :lol: . Spent hours over the years waiting for penetrating fluid to"soak in" and little turns back and forth to free it off. Waste of time.


Agreed. A nut splitter's handy too for where access is tight, or you can't use heat.
Plus gas type stuff seems to help if you have to save the thread(s) but it works best if the nut/bolt is moving a bit anyway.


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PostPosted: Tue Jun 12, 2018 7:19 pm 
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Yes, I would normally have just drilled it out to start with; heat and big wrenches were out due to the soft rubber mount, but it wasn't a hardened bolt so no worries. Just thought I'd try this penetrant to see how good it was... I think I now have the answer..

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PostPosted: Wed Jun 13, 2018 8:26 am 
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Interesting video here. Point in case that really brings it home, around the 9minute mark. Penetrating fluid left on an exposed stud and nut. The nut was only tightened by hand before allowing it to rust and it wasn't exactly caked on there since it only took 55ftlb to break it free. Even on such a lightly stuck nut, the penetration fluid failed to "penetrate".

So as I said, they really are snake oil designed to separate you from your money and not much else. Heat, shock, more POWER! really are the best things to use, and if it's a sensitive part like the OP, drill it or cut it out.

When I was dealing with some over torqued and slightly corroded wheel nuts I used heat and WD40, it was the heat that was dong the work and the WD40 was there as a lubricant only for when they finally started to move. After that job I bought a nice big breaker bar to keep in the boot of the car, the impact wrench is great but when you are on the side of the road, physics is your friend and it's cordless! lol


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