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Old 22-04-2011, 15:04   #1
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Thread Locker for Prop Zincs?

My diver changed the prop zinc on my flex-o-fold last week, and I threw the zinc the first time I used the boat, when I was backing down to set an anchor. (And I'm not one of these folks who sets an anchor in full reverse!) There was no more than 30 minutes of motoring time on that zinc.

The diver checked the boat today, and the bolt is missing as well as the zinc.

So the question is whether most folks apply some type of thread locker to the bolt holding a prop zinc in place. It would have to be something that you could apply underwater in this case, since my boat stays in the water year 'round. (Can lock-tite be applied in the water?)

All advice appreciated.

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Old 22-04-2011, 15:13   #2
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Re: thread locker for prop zincs?

you can apply loctite on the threads up on deck, and give it about 5 few minutes before you go down and assemble.

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Old 22-04-2011, 15:57   #3
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Re: thread locker for prop zincs?

From the Flexofold instructions:

Thread locker:
There is an underwater proof thread locker pre-applied on all screws in the installation. These screws can be instal-led out of or under the water.
Normal fluidic thread locker is not designed to be applied or cure under water and attempts to apply it under water will ultimately fail. Nor can regular thread locker be applied to the thread in air and allowed to cure before the screw is mounted under water. There will be no adhesion.
If removing the propeller underwater for any reason, do not reuse the screws when mounting again under the water. Please contact Flexofold for replacement screws that have the pre-applied thread locker.
When reusing the screws out of the water, make sure to apply a medium strength version of thread locker such as Loctite 243 (blue).
Never use a thread locker on the shaft nut (4). It will be difficult to dismount again.
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Old 22-04-2011, 15:58   #4
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Re: thread locker for prop zincs?

There should be star washers under the bolt heads or nuts to help lock them in place.
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Old 22-04-2011, 16:31   #5
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Re: thread locker for prop zincs?

i was advised the zincs have atendency to be thrown--i have yet to find that true-- gooodluck-- sounds like the star washers and/or the locktite my help----
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Old 31-10-2012, 00:05   #6
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Re: Thread Locker for Prop Zincs?

Just happened across this thread.
There are a couple ways to go with underwater installations.

1) Is the stick type, which you can put on a screw and let it dry up in a day or two.
2) Is the tape type that can be installed immediately. On small screws, like on my Maxiprop (4 mm) the tape has to stretched a bit to get it into the treads, a bit like teflon tape.

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Old 31-10-2012, 05:08   #7
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Re: Thread Locker for Prop Zincs?

Here is the e-mail I received from the makers of Loctite when I asked them what product could be applied to parts topside and safely used on said parts when assembled underwater (other Loctite products can be used underwater, but must be first assembled and allowed to cure above water, which is obviously problematic when replacing anodes underwater):

From: []
Sent: Monday, March 05, 2012 7:16 AM
To: Matt Peterson
Subject: RE: Henkel Inquiry - Case #: 00083412 [ ref:_00D301RJ1._50080IRF10:ref ]

If I am understanding you correctly, then this will not work. Loctite 243 will not cure unless it is between two pieces of metal and restricted of air, hence the name anaerobic. It will remain a liquid if you coat the bolt and just let it sit in open air. If you need a threadlocker that can be applied underwater, you will need to use Loctite 248 Quickstix or Loctite 249 Quicktape.


Rick Avery
Technical Engineering Representative
Henkel Corporation | AG Industrial Products
One Henkel Way
Rocky Hill, CT 06067
United States
Home - Henkel North America

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