Cruisers Forum

  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
Thread Tools Search this Thread Rate Thread Display Modes
Old 22-04-2011, 15:04   #1
CF Adviser
Bash's Avatar

Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
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.
cruising is entirely about showing up--in boat shoes.
Bash is offline   Reply With Quote
Old 22-04-2011, 15:13   #2
Registered User
doug86's Avatar

Join Date: Nov 2009
Location: Between Block Island and Bahamas
Boat: Marine Trader 40' Sedan Trawler, 1978. WATER TORTURE
Posts: 715
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.
"When one is willing to go without, then one is free to go." - doug86
doug86 is offline   Reply With Quote
Old 22-04-2011, 15:57   #3

Join Date: Jul 2007
Location: Florida cruising currently
Boat: Hunter 410
Posts: 18,386
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.
sailorboy1 is offline   Reply With Quote
Old 22-04-2011, 15:58   #4
Registered User

Join Date: Dec 2008
Location: ontario canada
Boat: grampian 26
Posts: 1,743
Re: thread locker for prop zincs?

There should be star washers under the bolt heads or nuts to help lock them in place.
perchance is offline   Reply With Quote
Old 22-04-2011, 16:31   #5
cat herder, extreme blacksheep
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 18,919
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
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----
life is an adventure meant to be LIVED!!!!
zeehag is online now   Reply With Quote
Old 31-10-2012, 00:05   #6
Registered User
delmarrey's Avatar

Join Date: Mar 2003
Location: Philippines
Boat: Itís in French Polynesia now
Posts: 11,264
Images: 122
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.

Attached Thumbnails
Click image for larger version

Name:	locktite2.jpg
Views:	133
Size:	340.5 KB
ID:	49049   Click image for larger version

Name:	loctite1.jpg
Views:	243
Size:	358.8 KB
ID:	49050  

Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
The measure of a man is how he navigates to a proper shore in the mist of a storm!
delmarrey is offline   Reply With Quote
Old 31-10-2012, 05:08   #7
Marine Service Provider
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 4,502
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
fstbttms is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Zincs Gone this Year sailorboy1 Construction, Maintenance & Refit 19 04-11-2010 19:10
Hanging Locker Tip JanetGroene Families, Kids and Pets Afloat 4 20-08-2010 13:30
How Many Zincs? markpj23 Propellers & Drive Systems 14 30-11-2009 09:53
Zincs Protection andreavanduyn Electrical: Batteries, Generators & Solar 25 27-10-2009 04:06
SD50 zincs chrisjs Propellers & Drive Systems 2 31-01-2009 19:52

Advertise Here

All times are GMT -7. The time now is 07:56.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.