Go Back   Trawler Forum > Maintenance and Systems > General Maintenance
Click Here to Login

Reply
 
Thread Tools Display Modes
 
Old 09-02-2015, 03:39 PM   #1
Senior Member
 
Dune's Avatar
 
City: Coastal SC
Country: USA
Vessel Model: Viking 65 CP MY (run at trawler speeds !)
Join Date: Jul 2015
Posts: 370
Recommend concoctions to inhibit cast aluminum thread corrosion (Radar pedestal) ?

Only 4 years in the elements but already one of the 3 SS bolts that holds my radar pedestal (the clamshell casting that holds the array motor and transmit electronics) together was really hard to remove. What is available at most local hardware stores that would help this not to get worse one I put it all back together ? I suppose enamel paint or a few drops of motor oil in the internal cast aluminum thread holes would be better than nothing....but even better ??
__________________
Advertisement

Dune is offline   Reply With Quote
Old 09-02-2015, 03:44 PM   #2
Guru
 
N4712's Avatar
 
City: South FL
Country: U.S.A
Vessel Name: Oliver
Vessel Model: Nordhavn 47 Hull# 12
Join Date: Apr 2013
Posts: 3,613
I'd use Tef-Gel.
__________________

__________________
Thanks, Oliver
M/V Oliver
Nordhavn 47 Hull #12
N4712 is offline   Reply With Quote
Old 09-02-2015, 03:47 PM   #3
Guru
 
caltexflanc's Avatar
 
City: North Carolina for now
Country: USA
Vessel Name: Small Incentive
Vessel Model: Boston Whaler 130 Sport
Join Date: Aug 2011
Posts: 3,792
Quote:
Originally Posted by N4712 View Post
I'd use Tef-Gel.
Ditto.
__________________
George

"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
caltexflanc is offline   Reply With Quote
Old 09-02-2015, 03:49 PM   #4
Senior Member
 
Dune's Avatar
 
City: Coastal SC
Country: USA
Vessel Model: Viking 65 CP MY (run at trawler speeds !)
Join Date: Jul 2015
Posts: 370
Quote:
Originally Posted by N4712 View Post
I'd use Tef-Gel.
Not heard of that one...would a typical hardware store have it ? If not, a small West Marine Express ? (at probably double the price of the hardware store !)


============================================


(on edit)
WM would have to order it. Hardware doesn't have it but does have Permatex Anti Seize lube...sounds like same thing from description....thoughts ?


Suspect Tef-Gel is better since it's considerably more expensive (not to mention it's "ultra" ! ;-))


http://www.permatex.com/products-2/p...bricant-detail


http://www.westmarine.com/buy/tef-ge...nt--P012222212
Dune is offline   Reply With Quote
Old 09-02-2015, 04:02 PM   #5
Guru
 
Capt.Bill11's Avatar
 
City: Sarasota/Ft. Lauderdale
Country: USA
Join Date: Apr 2014
Posts: 5,422
Tef-Gel or this:

Specialty Lubricants - Anti-Seize : Permatex® Anti-Seize Lubricant
Capt.Bill11 is offline   Reply With Quote
Old 09-02-2015, 04:43 PM   #6
Senior Member
 
City: louisiana
Country: usa
Join Date: Aug 2014
Posts: 207
Quote:
Originally Posted by Capt.Bill11 View Post
I have used permatex anti-seize to prevent galling between steel bolts and aluminum threads in marine and automotive applications. I use the nickel based formula. It works great (in fact the last boat I had, I used it to coat clamshell type clamps I made to mount the radar to the rigid FB aluminum cover frame) The only downside is it is messy...use very little and wear disposable gloves that are discarded immediately so you don't touch anything else and spread it everywhere! If you use too much it, rain/spray runoff can cause a little grey streaking to adjacent glass but it cleans up easily and that event stops after a little time in the weather. The Tef-gel does not have that issue but is harder to locate and more costly.
rardoin is offline   Reply With Quote
Old 09-02-2015, 04:59 PM   #7
Guru
 
djmarchand's Avatar
 
City: East Greenwich, RI
Country: USA
Vessel Name: Bella
Vessel Model: Mainship Pilot 34
Join Date: Aug 2012
Posts: 2,878
What you want to do is electrically insulate the stainless from the aluminum to limit galvanic corrosion. Believe it or not, Tef-Gel produces a very thin film between the two that limits corrosion. Other sealants might work, but boat riggers all use Tef-Gel for that purpose.


David
djmarchand is offline   Reply With Quote
Old 09-02-2015, 04:59 PM   #8
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 9,996
Haven't tried it for your application but I see no reason this stuff shouldn't work.
Super Lube 3 oz. Tube Synthetic Grease with Syncolon PTFE-21030 - The Home Depot
__________________
RTF
RT Firefly is offline   Reply With Quote
Old 09-02-2015, 05:00 PM   #9
Senior Member
 
catalinajack's Avatar
 
City: Edgewater, MD
Country: USA
Vessel Name: Catalina Jack
Vessel Model: Defever 44
Join Date: Nov 2011
Posts: 354
[QUOTE="rardoin;365528"]

Kopr-Kote. Great anti-seize compound. Even better for electrical connections especially on battery posts.
catalinajack is offline   Reply With Quote
Old 09-02-2015, 05:20 PM   #10
Guru
 
Xsbank's Avatar
 
City: Pender Harbour, BC
Country: Canada
Vessel Name: Gwaii Haanas
Vessel Model: Vancouver Shipyards Custom Aluminum 52
Join Date: Sep 2013
Posts: 2,447
Can't use copper and aluminum. If you need a thread compound use the aluminum-based one. Copper is good for other stuff, not stainless and aluminum.
__________________
Don't believe everything that you think.
Xsbank is offline   Reply With Quote
Old 09-02-2015, 05:41 PM   #11
Guru
 
boatpoker's Avatar
 
City: Port Credit
Country: Ontario
Vessel Name: DIRT FREE
Vessel Model: Benford Fantail 38
Join Date: Sep 2012
Posts: 2,011
Quote:
Originally Posted by Xsbank View Post
Can't use copper and aluminum. If you need a thread compound use the aluminum-based one. Copper is good for other stuff, not stainless and aluminum.
++ pay attention to this or you will pay heavily down the road.
__________________
If you can live with the consequences, go for it - wg
Y'am what I y'am an' thats' all that y'am - Popeye
As God is my witness, I thought turkey's could fly. Mr.C
boatpoker is offline   Reply With Quote
Old 09-02-2015, 07:28 PM   #12
Guru
 
caltexflanc's Avatar
 
City: North Carolina for now
Country: USA
Vessel Name: Small Incentive
Vessel Model: Boston Whaler 130 Sport
Join Date: Aug 2011
Posts: 3,792
Quote:
Originally Posted by RT Firefly View Post
Haven't tried it for your application but I see no reason this stuff shouldn't work.
Super Lube 3 oz. Tube Synthetic Grease with Syncolon PTFE-21030 - The Home Depot
I have that stuff, like it and use it for all sorts of things, but it is not as durable as TefGel, which purpose-designed for exactly what the OP needs. You can get TefGel in SC in a couple of days from Florida or a place like Defender.

Funny, I just used some Super Lube this afternoon to grease the pole to a free standing bird feeder to keep the squirrels off.
__________________
George

"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
caltexflanc is offline   Reply With Quote
Old 09-02-2015, 07:50 PM   #13
Guru
 
HopCar's Avatar


 
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 3,505
An outboard mechanic once taught me to coat the threads of stainless bolts with Permatex #3 gasket compound when you were putting them into aluminum. It really worked. The next time he worked on an engine it was a lot easier to take apart.

It's counter intuitive but I think Locktite will also prevent stainless from binding with aluminum.
__________________
Parks Masterson
www.hopkins-carter.com
HopCar is offline   Reply With Quote
Old 09-02-2015, 07:54 PM   #14
Senior Member
 
Dune's Avatar
 
City: Coastal SC
Country: USA
Vessel Model: Viking 65 CP MY (run at trawler speeds !)
Join Date: Jul 2015
Posts: 370
Quote:
Originally Posted by HopCar View Post

It's counter intuitive but I think Locktite will also prevent stainless from binding with aluminum.
Blue Loctite maybe.....Red Loctite would lock the threads.
Dune is offline   Reply With Quote
Old 09-02-2015, 09:28 PM   #15
Guru
 
kchace's Avatar
 
City: Brookline, NH
Country: USA
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 759
Never-Seize. The standard seems to work fine between aluminum and stainless, but the Nickel is best for mixed metals in a salt environment. Been using it on boats for over 40 years and screws always come back out even years later.



Ken
kchace is offline   Reply With Quote
Old 09-02-2015, 09:58 PM   #16
Guru
 
AusCan's Avatar
 
City: Adelaide
Country: Australia
Vessel Name: Kokanee
Vessel Model: Cuddles 30 Pilot House Motor Sailer
Join Date: Jul 2012
Posts: 2,095
I'd suggest Tef-Gel as well. I buy it at an electronic components supply place; much cheaper than from a marine supplier.
AusCan is online now   Reply With Quote
Old 09-03-2015, 06:15 AM   #17
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,524
I have had good lick with tefflon tape .

It squishes and doesn't leave room for standing air & water.
FF is offline   Reply With Quote
Old 09-03-2015, 07:22 AM   #18
Guru
 
Shoalwaters's Avatar
 
City: Rodney Bay Lagoon
Country: St. Lucia, West Indies
Vessel Name: "Dragon Lady"
Vessel Model: DeFever 41
Join Date: Feb 2008
Posts: 681
Tef-Gel definitely. Order online and keep in tool box. Used sparingly (according to the instructions) a tube lasts a long time. Get this stuff.
__________________
Mike
If all else fails, read the instructions
If it ain't broke, don't fix it
Shoalwaters is offline   Reply With Quote
Old 09-03-2015, 09:33 AM   #19
Guru
 
Carolena's Avatar
 
City: DC
Country: USA
Vessel Name: Carolena II
Vessel Model: Nordic Tug 32/34
Join Date: Aug 2012
Posts: 605
Another vote for Tef-Gel. We used it all over the sailboat, including when we changed out all the standing rigging (ourselves). Expensive but really does last a very long time. We've been using the same tube for around eight years and it isn't even half gone.
Carolena is offline   Reply With Quote
Old 09-03-2015, 10:37 AM   #20
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,884
I use boat trailer wheel bearing grease anytime SS is threaded into Al around salt. Learned the trick from outboard mechanics. Pull a gearcase ten years after using the stuff, bolts come right out and are still greasy.

Anytime I buy an outboard, I take as many bolts out that are easy to get to and grease em up.

The grease is cheap and readily available. Probably does the same thing as the tef gel, keep the water out of the galvanic couple and all is good. I'll look into that tef gel.
__________________

Ski in NC is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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





All times are GMT -5. The time now is 05:18 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012