Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 18-06-2009, 20:36   #1
Registered User

Join Date: May 2008
Posts: 1,969
Stainless Fittings on Painted Mast

I need to install some new stainless fittings on an awlgrip painted mast. I know to use TefGel on the stainless screws but what should I put between the back of the fitting and the mast to stop galvanic corrosion and avoid bubbling paint? I've also been told that some solutions will provide electrical insulation but still trap water that causes corrosion. I've had suggestions for:

Silicone caulk

4200

Pieces of cut up Clorox bottles

Electrical tape

Cover the whole back of the fitting with TefGel

Nothing - the paint is an insulator

Thanks

Carl
__________________

__________________
CarlF is offline   Reply With Quote
Old 18-06-2009, 21:05   #2
Registered User

Join Date: Sep 2007
Location: Bahia De Caraquez, Ecuador
Boat: Mayotte/Voyage 47' catamaran
Posts: 97
Send a message via Skype™ to quartersplash
Hi,
I am in the process of redoing the mast off the boat and am interested in the same question. I have tefgel also for the screws and a durable rubber, very thin with a fabric inside to keep it from squeezing out from under the fitting.
__________________

__________________
quartersplash is offline   Reply With Quote
Old 09-07-2009, 11:24   #3
Registered User
 
FloridaWriter's Avatar

Join Date: Jan 2009
Location: Maitland, FL
Boat: Bristol 29
Posts: 230
I use thin Teflon sheeting between the hardware and the mast; and caulking of some kind in the tapped screw holes. I have not had a bit of corrosion with this method over the past 20 years.

Current modifications to mast of my Bristol 29
__________________
David www.bristol29.com
"The lookout that first sights the cat shall have ten guineas and remission of sins, short of mutiny, sodomy, or damaging the paintwork." - Jack Aubrey
FloridaWriter is offline   Reply With Quote
Old 09-07-2009, 11:32   #4
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,150
I use nylon washers quite frequently. If it is something that is going to be heavily loaded and might compress the nylon washers then I would use a thin Delrin spacer.

Whatever sort of spacer you use, take into consideration the loading so that you use a material that will not distort under the compression. Teflon is pretty soft but under light loading works great. Nylon is a little harder and Delrin is very hard and very resistant to distortion. Definitely use the Tef-Gel for the stainless steel fasteners into the aluminum.

I find that with caulk for this kind of application it almost always fails because it eventually delaminates from whatever it was applied to, allowing water in.

I have successfully stopped Awlgrip from bubbling up from aluminum corrosion where I have threaded stainless into aluminum by bedding the heck out if it with Tef-Gel. You may not need any plastic spacer at all depending on the application. Tef-Gel will remain a soft sticky gel that displaces water for many many years without changing its physical properties or washing away...that's the beauty of it.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 10-07-2009, 00:02   #5
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,198
Tef Gel for the fasteners and either thin Teflon sheet or thin (hard) neoprene rubber sheet between paint and hardware.

Our mast is 15 years old and has some paint off. For testing I cleaned some of these spots to the bare aluminium and just rubbed some tef gel on. It's still exactly like that after 4 years; I can still feel the tef gel is there. Amazing stuff.

cheers,
Nick.
__________________
s/v Jedi is offline   Reply With Quote
Reply

Tags
mast

Thread Tools
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
Sealing Diesel Fittings Stevens 47 Construction, Maintenance & Refit 6 07-01-2009 09:42
Retrofitting a wood mast vs current metal mast grefark Deck hardware: Rigging, Sails & Hoisting 7 07-09-2008 22:44
Norseman Fittings???? cburger Deck hardware: Rigging, Sails & Hoisting 1 06-08-2008 16:10
PAINTED CAPRAIL to a "TEAK LOOK" High Cotton Construction, Maintenance & Refit 8 26-12-2007 21:53
Thruhull fittings Stevek Construction, Maintenance & Refit 7 23-09-2006 18:29



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:23.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.