thread lock for prop zinc? - SailNet Community
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post #1 of 23 Old 10-20-2018 Thread Starter
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thread lock for prop zinc?

what do you guys use?

Someone told me put blue thread lock on and let it cure in air before installing underwater.

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post #2 of 23 Old 10-20-2018
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Re: thread lock for prop zinc?

Never heard of any such thing. Zincs come with SS Allen screws and I've never had one come loose before the zinc has deteriorated so much that the screw is useless.
Save your money and time.

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post #3 of 23 Old 10-20-2018
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Re: thread lock for prop zinc?

The thread lock on the contact surface may insulate the anode rendering it useless. If you do use it (I never have), make sure it's confined to the screws
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post #4 of 23 Old 10-20-2018 Thread Starter
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Re: thread lock for prop zinc?

thanks for the responses.

I should have added that I just switched props and the old zinc was held on by 3 plastic fasteners. the new one is one stainless screw...hence my question.

the prop came with all its fasteners pre-coated with a thread loc for installation underwater.

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post #5 of 23 Old 10-20-2018
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Re: thread lock for prop zinc?

several of the anode brands come with the screws with the thread lock pre coated on the screws . can't hurt

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post #6 of 23 Old 10-20-2018
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Re: thread lock for prop zinc?

After you've put the zinc on coat the screw area with nail polish.
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Re: thread lock for prop zinc?

Quote:
Originally Posted by misfits View Post
After you've put the zinc on coat the screw area with nail polish.
Clear coat or rojo caliente?
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Re: thread lock for prop zinc?

Whatever is avaliable from your wife, daughter or girlfriend.
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post #9 of 23 Old 10-21-2018
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Re: thread lock for prop zinc?

We had a tailcone zinc for our MaxProp disappear one year (out of the 22 yrs we’ve owned this boat) and the 3 screws were also gone. The prop was uncoated that year and showed noticeable pitting, which led to a MaxProp overhaul at PYI. Hadn’t had a problem with the zinc before or since.

For quite a few years now, we’ve been coating the prop with Pettit zinc spray, sanding the prop and zinc where they contact, coating the screws with the blue stuff, and coating the area of the zinc around the screw heads with nail polish. The attached photo shows you what the prop looked like a few weeks ago after haul out and pressure washing by the yard. Must be about 98% of the zinc is left.
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post #10 of 23 Old 10-22-2018 Thread Starter
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Re: thread lock for prop zinc?

I asked boatzincs.com...here is their answer:

Thread locker is something we tell folks to consider only if they're having a specific problem with the bolt rocking out. Otherwise, it's probably not necessary.

If you would like to use it, we like Vibra-Tite VC-3 (https://www.boatzincs.com/vibratite-specs.html). As with any thread locker, a little goes a long way. We recommend thinly coating the tip of the bolt, letting it dry, and then installing.

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