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Author Topic:   Anti-seize products and Outboards
whalerron posted 02-27-2002 01:47 PM ET (US)   Profile for whalerron   Send Email to whalerron  
I have read conflicting statements on this forum concerning the use of anti-seize with stainless steel bolts when they are threaded into aluminum. Some people have said to use anti-seize or else you will never get the parts apart and other people have said don't use anti-seize because it causes a galvanic reaction that makes it impossible to remove the bolts. This has bothered me because I have always used anti-seize on my outboards and I have never had a problem.

So, I contacted 2 anti-seize manufacturers and asked them whether or not anti-seize should be used where stainless steel bolts are going into aluminum castings and the whole mess is subjected to salt and fresh water. Both said that copper anti-seize is perfect for this application.

Here was my question to the manufacturers:

Is it ok to use anti-seize on stainless steel bolts that are threaded into aluminum castings on outboard motors. The assemblies are subject to salt water and fresh water.

The following are their responses:

From Peter Haig, Director at Molyslip Atlantic Ltd (

In one word "YES" (although there are some particular situations where a copper-anti-seize with stainless steel can result in di-electric corrosion.
Therefore we can also offer our Aluminium/Graphite anti-seize as an
alternative. This is equally effective, but may have a more pleasing aesthetic result, as it will colour match your mountings!).

From Hank Beckman, Technical Services at Permatex (440-914-3574)

The anti-seizes we make have no problems with saltwater. There is a specific one made for stainless to prevent gauling and reaction. It is called Copper Anti-seize Lubricant part number 09128.

reelescape1 posted 02-27-2002 03:36 PM ET (US)     Profile for reelescape1  Send Email to reelescape1     
I pulled the foot bolts out of my new Johnson 25 in 1996, anti-siezed them, re-installed them and have been running in salt since. I put a water pump in about 2 weeks ago (first ever) and everything is fine. That was C-5A copper based.
peteinsf posted 02-27-2002 03:55 PM ET (US)     Profile for peteinsf    
I have used "never-seize" for years and have not had any problems. It doesn't look like a copper based product from the color, silver paste...
browning20ga posted 02-28-2002 02:32 AM ET (US)     Profile for browning20ga  Send Email to browning20ga     
I've used regular old Permitex Anti-Seize ever since I replaced the first waterpump in my old 15hp. Evenrude about 15 years ago, never a problem. The first time I dissasembled it I had 1 screw seized and had to have a Heli-Coil installed in that hole. Never a problem after using anti-seize, dissambled 3 or 4 times since using anti-seize, I'm sold on the stuff. Motor spends about 50% in saltwater and 50% in fresh over 20 years.


lhg posted 03-06-2002 11:52 PM ET (US)     Profile for lhg    
Starbrite sells a tube of copper based anti-seize. It works well and is recommended. I would be lost without this stuff on my aluminum Big John downriggers.
joycot posted 05-01-2004 11:00 AM ET (US)     Profile for joycot  Send Email to joycot     
The real answer to anti-seize when two different metals are involved is Nickel Anti-Seize Compound. I think made by

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