Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-10-2017, 04:46 PM   #1
Senior Member
 
Dave_E's Avatar
 
City: La Conner, WA
Country: USA
Vessel Name: Agnus Dei
Vessel Model: 36' Shin Shing
Join Date: Sep 2014
Posts: 225
Thru Hull hardware sealing

Hi All,

One of the finds yesterday during the haul out was some badly corroded and probably leaking bolts from the swim platform. What sealant is best to use with all the new SS hardware? 4200, 5200. Boat will be out of the water for a week.

Dave
__________________
Advertisement

__________________
GOD, Family, career
Dave_E is offline   Reply With Quote
Old 08-10-2017, 04:54 PM   #2
Senior Member
 
Sugardog's Avatar
 
City: Alexander
Country: USA
Join Date: Aug 2017
Posts: 152
5200 below the waterline, 4000 above is what I use. Been doing it for decades and had good luck.
__________________

Sugardog is offline   Reply With Quote
Old 08-10-2017, 04:55 PM   #3
Senior Member
 
Sugardog's Avatar
 
City: Alexander
Country: USA
Join Date: Aug 2017
Posts: 152
4000 has better UV properties.
Sugardog is offline   Reply With Quote
Old 08-10-2017, 05:54 PM   #4
Moderator Emeritus
 
dwhatty's Avatar
 
City: Home Port: Buck's Harbor, Maine
Country: USA
Vessel Name: "Emily Anne"
Vessel Model: 2001 Island Gypsy 32 Europa (Hull #146)
Join Date: Sep 2008
Posts: 2,812
4200 for fittings above and below. 5200 if you want to cuss and swear a lot when you inevitably have to remove the fitting. 4000 for caulking around windows and such.
__________________
David Hawkins
Deer Isle, Maine
dwhatty is offline   Reply With Quote
Old 08-10-2017, 06:28 PM   #5
Guru
 
Tom.B's Avatar
 
City: Cary, NC
Country: USA
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,703
Sikaflex 291!
__________________
2000 Navigator 4200 Classic
(NOT a trawler)
Tom.B is offline   Reply With Quote
Old 08-10-2017, 06:56 PM   #6
Senior Member
 
Sugardog's Avatar
 
City: Alexander
Country: USA
Join Date: Aug 2017
Posts: 152
dwhatty, you are so right about 5200.
Sugardog is offline   Reply With Quote
Old 08-10-2017, 06:58 PM   #7
Guru
 
Lou_tribal's Avatar
 
City: Quebec
Country: Canada
Vessel Name: Bleuvet
Vessel Model: Custom Built
Join Date: Jan 2016
Posts: 3,513
Quote:
Originally Posted by Tom.B View Post
Sikaflex 291!
For windows or any other things you want to be watertight above the waterline +1 for Sikaflex 291. I use 291 LOT for windows trim as it allows you time to setup everything.

If you want to seal something but keep it removable if needed, 4200 is good.
If you want to seal something hard, solid, unmovable and rock solid 5200 is the one.

Each one has its usage.

L.
Lou_tribal is offline   Reply With Quote
Old 08-10-2017, 09:09 PM   #8
Guru
 
Tom.B's Avatar
 
City: Cary, NC
Country: USA
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,703
Quote:
Originally Posted by Lou_tribal View Post
For windows or any other things you want to be watertight above the waterline +1 for Sikaflex 291. I use 291 LOT for windows trim as it allows you time to setup everything.

If you want to seal something but keep it removable if needed, 4200 is good.
If you want to seal something hard, solid, unmovable and rock solid 5200 is the one.

Each one has its usage.

L.
I have used it for all the thru-hull I have added (of course... that doesn't really PROVE anything, but they are still holding well after two years). Anyway, it is my opinion that there is little need to bond something like a thru-hull so tight that it takes a Sherman tank to get it loose. Thru hulls need replacing every now and then and having it be removable is a better way to go.


Sikaflex®-291

Sikaflex®-291 is a 1-component, marine grade polyurethane elastomeric adhesive and sealant. Used by many boat builders, its fast cure time makes it ideal for applications where speed is important.
Use

General all-purpose, marine adhesive and sealant, which may be used for light duty bonding. Sikaflex®-291 has excellent adhesion to gelcoat, fiberglass, metal and wood that can be gunned or brushed into place.
Characteristics and Advantages

  • Use above and below water line Resists salt water
  • Fast strength build-up
  • Paintable and sandable
  • Excellent bond
  • NSF approved for potable water (black and white only)
  • USDA approved for incidental food contact
Color

White and Black
__________________
2000 Navigator 4200 Classic
(NOT a trawler)
Tom.B is offline   Reply With Quote
Old 08-10-2017, 09:19 PM   #9
Guru
 
kapnd's Avatar
 
City: hawaii
Country: usa
Vessel Name: #31
Vessel Model: ex-Navy MUB 50 fish/cruise
Join Date: Aug 2013
Posts: 541
Quote:
Originally Posted by Dave_E View Post
Hi All,

One of the finds yesterday during the haul out was some badly corroded and probably leaking bolts from the swim platform. What sealant is best to use with all the new SS hardware? 4200, 5200. Boat will be out of the water for a week.

Dave
Your problem is probably in the hardware, not the sealant.
Silicone Bronze fasteners should be used in underwater applications.
Hope your transom is not cored!
__________________
You can lead a horse to water,
But you can't make him ski...
kapnd is offline   Reply With Quote
Old 08-11-2017, 01:07 AM   #10
Guru
 
HopCar's Avatar
 
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 4,389
Real men use 5200. Girly men use 4200.
Kapnd (spell corrected to "lap dance") is right. I bet your fasteners are 304 stainless. Switch to bronze or at least type 316 stainless.
__________________
Parks Masterson
HopCar is online now   Reply With Quote
Old 08-11-2017, 06:11 AM   #11
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,736
5200 is a glue that seals.

AS all sealants fail in time one that is easy to remove and replace is the least amount of work over time.

To install a seacock 5200 might be OK, but for the thru hull screwed into the seacock Dolphinite is easy to work with.

Ports , hatches ,windows, deck hardware all are easier to R&R with non glue.

Most of the dissolving decks on TT seem to come from leaks at fittings , that are not on a PM list for sealant R&R.
FF is offline   Reply With Quote
Old 08-11-2017, 08:23 AM   #12
Guru
 
Maerin's Avatar
 
City: East Coast
Country: USA
Vessel Name: M/V Maerin
Vessel Model: Solo 4303
Join Date: Jun 2013
Posts: 825
Ditto the cautions on 5200. It's permanent. I made the mistake of installing a depth transducer with it, the transducer failed and had to be replaced. What a fight to remove it! Never again! I installed the replacment and bedded it with a lot of polysulfide (Life-Caulk). Won't harden, cures underwater, and isn't an adhesive. An adhesive isn't really required for a thru-hull, it's a mechanical attachment, so it only needs to be sealed. Polysulfide is an excellent sealer, but can be removed if needed.
__________________
Steve Sipe
Selene 4303 Maerin
http://maerin.net
Maerin is online now   Reply With Quote
Old 08-11-2017, 06:56 PM   #13
Guru
 
Tom.B's Avatar
 
City: Cary, NC
Country: USA
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,703
Quote:
Originally Posted by Maerin View Post
Ditto the cautions on 5200. It's permanent. I made the mistake of installing a depth transducer with it, the transducer failed and had to be replaced. What a fight to remove it! Never again! I installed the replacment and bedded it with a lot of polysulfide (Life-Caulk). Won't harden, cures underwater, and isn't an adhesive. An adhesive isn't really required for a thru-hull, it's a mechanical attachment, so it only needs to be sealed. Polysulfide is an excellent sealer, but can be removed if needed.


That, sir, is an excellent point.
__________________

__________________
2000 Navigator 4200 Classic
(NOT a trawler)
Tom.B is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 06:33 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×