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Old 01-07-2020, 10:36   #1
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White chalky thread lock

Hi everyone, super noob question here but I've noticed in almost every stainless steel bolt on my boat (that I've removed) there is this white thread lock stuff, that is kind of chalky when the bond is broken and I unscrew the bolt.

Can someone please inform me what this product is? I'd like to use the same product.

Thnks!!!
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Old 01-07-2020, 11:35   #2
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Re: White chalky thread lock

What material are these bolts threaded into? Most people use an anti seize on stainless, but I wouldn't describe it as chalky. SS fasteners threaded into aluminum without antiseize will get locked in place by a white chalky aluminum oxide, not what you want, they can be impossible to remove.
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Old 01-07-2020, 12:13   #3
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Re: White chalky thread lock

Hi Four Lyons,

These are stainless bolts going into stainless nuts. The chalky stuff is definitely not corrosion. It's some kind of thread locker. It gets chalky once you break the bond, bits of it crumble out but the threads remain packed with it.
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Old 01-07-2020, 12:45   #4
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Re: White chalky thread lock

I've seen that as well, maybe some kind of sealant or plumbers putty?
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Old 01-07-2020, 13:43   #5
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Re: White chalky thread lock

Could it be this stuff?

https://www.amazon.com/567-Thread-Se...49&sr=8-2&th=1
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Old 01-07-2020, 15:19   #6
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Re: White chalky thread lock

Loctite gets white and crumbly when it breaks down, especially the red loctite.
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Old 01-07-2020, 16:40   #7
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Re: White chalky thread lock

Well, Cape Dory was known to build a damn good boat, what sealant was state-of-the-art 40 years ago, and used elsewhere on the boat?
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Old 01-07-2020, 17:02   #8
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Re: White chalky thread lock

Maybe I should ask what kind of thread lock I should be using when I put stuff back together.
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Old 01-07-2020, 17:18   #9
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Re: White chalky thread lock

Is this on a SS bolt and nut? Or a SS into Aluminum?
It might be 3 M 4200 as it remains flexible (do not use 5200)
Or duaralac for the thread
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Old 02-07-2020, 10:55   #10
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Re: White chalky thread lock

Here's a picture of one, this one I believe was actually going into the aluminum masthead. It's the base of a windex

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Old 02-07-2020, 13:19   #11
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Re: White chalky thread lock

I can confirm that Loctite goes a sort of white and I suppose you might call powdery consistency when it has fully cured. I wouldn't say it has broken down, that's just the way it sets, I know because I had to break a Loctite seal on a Stainless nut and bolt the other day, that had only been on about a month, was an absolute b**ch to undo and could not use heat on it as it was adjacent to a plastic fitting, although I understand that using a high power soldering iron on the nut or bolt head will often do the trick. When I did finally get it off, it had a white powdery coating which must haver been the Loctite since that is what I used to lock it in place.
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Old 02-07-2020, 14:00   #12
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Re: White chalky thread lock

Quote:
Originally Posted by mikebikeboy View Post
Here's a picture of one, this one I believe was actually going into the aluminum masthead. It's the base of a windex

Yeah, that’s aluminum oxide I believe.
You were lucky to get it out if it had been there 40 years, when you put it back coat it with Tef gel, or there are copy cat products for much less money.

Thread sealant wise, I keep two blue and red Loctite, red for if you really, really don’t want to remove it, or if it won’t hurt to get it propane torch hot, a propane torch will completely break down red Loctite.
Blue for everything else.
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Old 02-07-2020, 14:18   #13
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Re: White chalky thread lock

Interesting, here I thought it was some kind of thread locker. Well I guess it is thread locker but not the kind you want :P

So the Tef Gel stuff, you put that on threads or any part of the stainless that'll come in contact with aluminum?
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Old 02-07-2020, 14:29   #14
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Re: White chalky thread lock

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So the Tef Gel stuff, you put that on threads or any part of the stainless that'll come in contact with aluminum?

Yes, it attempts to isolate the two metals, it’s not a locking compound. But any screw or bolt put into aluminum without something similar becomes a rivet over time.
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Old 02-07-2020, 14:32   #15
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Re: White chalky thread lock

That's definitely oxidation. Use TefGel or Lanacote to avoid it. If locking is necessary use blue locktite. Use red only where you must and where you can be able to apply heat to remove it because heat is pretty necessary. Locktite will prevent oxidation if you use enough of it to cover the threads and isolate them from each other..

Remember when we talk about locktite colors we are talking about the liquid itself and NOT the color of the bottle. Illogically the red locktite is often bottled in a blue container, and the blue locktite is often bottled in a red container -just to confuse and befuddle their customers. When questioned about this the company always blames the customers for any misunderstandings. Go figure...


With regards to Tefgel versus Lanacote I prefer Lanacote myself, but that is probably because I love the smell of sheep.
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