Saltwater and Neverseize

Discussion in 'General Discussion' started by mquiet, Jan 12, 2018.

  1. mquiet

    mquiet Member

    Aug 4, 2009
    North carolina
    1999 480 Sedan Bridge
    Caterpillar 3196
    I heard last night that you should not use Neverseize on bolts for boats that are in the salt water. Is this true? Is there a better product to keep the bolts from seizing?
  2. bmac

    bmac Active Member

    Jan 11, 2008
    Holbrook, NY
    2006 58 Sedan Bridge, Walker Bay Generation 390 RIB w/40hp Yamaha, 2014 Wellcraft 232 CC w/Yamaha
    MAN 900 CRM
    If I recall from my nuclear power plant days, Neverseize contains certain metallic compounds which would contribute to galvanic corrosion when applied to metal fasteners exposed to salt water.
  3. fwebster

    fwebster Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    Oct 6, 2006
    Middle Tennessee ; Panama City Beach, FL
    1996 450DA
    3116 Caterpillars
    Brian is correct. Most anti-seize lubricants contain copper or aluminum, or both. In the presence of moisture, they can do just then opposite of their intended purpose.

    Alternative is Mercury Extreme Grease (part # 92-8M0071838).
  4. rcknecht

    rcknecht Active Member

    Mar 23, 2009
    toms river,nj
    340 Sundancer 2001
    T 454 MPI
    I use neversieze on manifold and exhaust bolts... I am in saltwater, but these bolts are not in direct contact with salt water... I have not had any problems...
  5. mquiet

    mquiet Member

    Aug 4, 2009
    North carolina
    1999 480 Sedan Bridge
    Caterpillar 3196
    Thanks for the confirmation. Good to know. Frank, thanks for the alternative.
  6. GCHOG

    GCHOG Member

    Mar 25, 2016
    Bass River, Viking Marina, South Jersey
    2006 Sea Ray 260 Sundancer
    6.2 Bravo III
    I use both Copper and Aluminum based "Loctite" brand anti-seize daily at my profession as an equipment repair tech and always have positive results. yes , I do use it on my boat. This summer I had to remove both B-3 props for repair. I had removed the props a year ago just for maintenance checks and installed them with copper anti-seize on the shafts. When I removed them this summer , the anti-seize looked like new and the props came off very easily. I do boat in both fresh and salt water. I also use it on exhaust manifold bolts. Honestly, I wouldn't think of not using it just because of the results I see daily . Just my .02 cents worth.
    quote from the label:
    Loctite C5-A: It prevents seizing and galling caused from heavy loads,vibration, corrosion and temperatures up to 1800d. For use with most metals, under most conditions , including cast iron and steel, nickel, copper, brass,bronze, titanium,aluminum and monel.
  7. juggernaut1

    juggernaut1 Active Member

    Apr 19, 2015
    Perth, Western Australia
    2006 38 Sundancer
    8.1S / ZF 63V Drives
    Or the Mercury 2-4-c with PTEF which is recommended to be used for prop shaft threads, amongst other things.

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