Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 21-10-2022, 10:21   #1
Registered User

Join Date: Oct 2022
Posts: 26
Sealing portlights

We have a 40 year old sloop that has port lights below deck that leak on high seas. We are thinking of caulking them with 4200, rubber gasket against stainless. We never open them and they have never stopped leaking despite being cranked down all the way. Is 4200 the right stuff? Is the notion harebrained?
IguanaSwim is offline   Reply With Quote
Old 21-10-2022, 16:58   #2
Marine Service Provider

Join Date: Dec 2010
Location: Little Compton, RI
Boat: Cape George 31
Posts: 2,690
Re: Sealing portlights

Should work. 5200 will as well, as long as sunlight doesn't get to it for too long.
__________________
Ben
zartmancruising.com
Benz is offline   Reply With Quote
Old 21-10-2022, 17:16   #3
Registered User

Join Date: Oct 2022
Posts: 26
Re: Sealing portlights

Thank you. We feel better about sealing them now.
IguanaSwim is offline   Reply With Quote
Old 23-10-2022, 10:08   #4
Moderator
 
tkeithlu's Avatar

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Fiberglas shattering 44' steel trawler
Posts: 5,907
Re: Sealing portlights

Butyl tape is the usual bedding recommendation for port lights. If you use 3M 5200, first say clearly with your right hand raised "I never, ever, want to open this port again, and neither will any future owner."
__________________
Never let anything mechanical know that you are in a hurry.
tkeithlu is offline   Reply With Quote
Old 23-10-2022, 10:15   #5
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jun 2018
Location: Rock Hall, MD
Boat: Mariner 39
Posts: 532
Re: Sealing portlights

Are we talking about sealing the portlight frame against the hull, or sealing the part that opens against the frame when it is closed?

We are having trouble with the latter. The rubber gaskets are somewhat dried and brittle. We are about to undertake replacement of those.
JoeRobertJr is offline   Reply With Quote
Old 23-10-2022, 10:48   #6
Registered User

Join Date: Oct 2022
Posts: 26
Re: Sealing portlights

Am talking about making sure they are completely closed. 4200 isnít as eternal as 5200. Weíve also lost a dog on a few and so are relying on three to keep it closed. We are crossing seas and canít have a leak or a blow out. Butyl is great but not strong enough.

Farther aft we want the option to open them. We cleaned then lubed with silicone grease. Apparently vasiline damages the gaskets.

Thanks all for the help!
IguanaSwim is offline   Reply With Quote
Old 24-10-2022, 12:22   #7
Registered User

Join Date: Dec 2010
Location: Pacific Northwest
Boat: Boatless in Seattle. Ex- Alberg 30, 30’ Gillnetter, 63’ Wm. Hand Ketch, 36’ Lapwor
Posts: 293
Re: Sealing portlights

So you really need the port lights? One option is take them out and glass over the holes in the hull. Nothing better than that for keeping water out.

Alternately, try Dolphinite bedding compound to seal up the frame. Dolphinite is the traditional method for bedding wood members, plywood, deck fittings etc. it works wonderfully, cleans up easily and lasts 40+ years. Much more effective than 4200 or butyl tape.

Imbedded every screw, deck fitting and all portholes with Dolphenite on my last boat .- an alberg 30. The next owner sailed it across the pacific, from SF to the Phillipines and never took on one drop of water from a leak. Been using it on boats since 1970. It’s really good stuff.
Glenn.Brooks is offline   Reply With Quote
Old 24-10-2022, 14:26   #8
Registered User

Join Date: Aug 2021
Location: PNW
Boat: 35 Ft. cutter, custom
Posts: 1,379
Re: Sealing portlights

The Op says, "Rubber gaskets against stainless".
I presume that is the gasket that seals the opening frame against the hull mounted fixed frame.
There are at least a billion different O-rings made from several materials and in sizes from microscopic to measured in feet, and of a wide variety of thicknesses.
Take one of the opening parts to a company that deals in seals, they will fix you up with something that will fit and won't leak.
Also, the above post about Dolphinite is spot on.
It truly is a product that anyone with a boat should have a can on board.
It ain't just for wood, hint, once you open it you want to make d#*n sure that the lid goes back on cleanly, and store the can upside down.
__________________
Beginning to Prepare to Commence
Bowdrie is online now   Reply With Quote
Old 24-10-2022, 17:35   #9
Registered User

Join Date: Aug 2021
Location: PNW
Boat: 35 Ft. cutter, custom
Posts: 1,379
Re: Sealing portlights

Addendum.
Something I'll add, while you have the opening section(s) removed, see if you can lay a piece of glass, (or other FLAT piece of something.) against the hull mounted section that the opening frame closes against.
Far too many portlights, (of whatever shape, along with hatches,) get installed on curved surfaces by ignorant people who know no bounds when it comes to tightening the bolts on such hardware.
The hardware frames get twisted/warped/bent out of plane, and never seal properly once the original soft gasket gets some age on it.
__________________
Beginning to Prepare to Commence
Bowdrie is online now   Reply With Quote
Old 29-10-2022, 09:18   #10
Registered User

Join Date: Mar 2022
Location: Ontario Canada
Boat: Jeanneau SO 389
Posts: 1,969
Re: Sealing portlights

I’ve heard of this other product but I carry Lexel for emergency of permanent fixes.
If you need fresh fat gaskets for old frames and the hinge and pin are healthy you can print them in TPU
You can supply a drawing of the gasket go onto cults3D.com ask for local printer familiar with TPU. It’s like modern rubber and you can program it’s density and compression. UV chemical fuel proof very durable. You can buy sheets of TPU or TPE but you are looking to replace a puffy gasket with no seam.
Rumrace is offline   Reply With Quote
Reply

Tags
How to seal leaky gaskets, portlights

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Butyl for sealing portlights and other questions? Reefmagnet Construction, Maintenance & Refit 21 04-09-2015 14:45
sealing a wire hole in stainless tube arch and bow pulpit schoonerdog Construction, Maintenance & Refit 8 16-02-2008 07:33
Sealing thru hull in ferro emmo Construction, Maintenance & Refit 5 29-09-2006 00:50
heat sealing stamoid kimberlite General Sailing Forum 2 10-01-2006 18:12
Sealing Water Tanks rleslie Construction, Maintenance & Refit 3 17-05-2005 18:48

Advertise Here


All times are GMT -7. The time now is 18:13.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.