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11-01-2020, 05:32 PM
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#1
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Veteran Member
City: Sturgeon Bay, Wisconsin
Join Date: Sep 2019
Posts: 54
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Sealing a forward hatch
Hello, I need advice on sealing the forward hatch on my boat. I have stripped the varnish and removed the glass and am now attempting to plan on how to seal the glass. It has always had a terrible seal around the glass, leaking during rain or big seas and has therefore always been covered by canvas. The angulation is about 14 degrees which I believe allowed enough water to sit and work it's way through. My hope is that I can achieve a good enough seal to be able to leave the hatch uncovered. My first thought was a 3m 4200, but I don't think it plays well with glass. The design of the hatch has the glass sitting in a well without mechanical retention. Anyone have any advice on how to seal the glass to the teak frame and finally achieve a waterproof hatch?
I appreciate the help!
Gratuitous picture below.
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11-01-2020, 05:36 PM
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#2
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Guru
City: Southport, FL near Panama City
Vessel Name: FROLIC
Vessel Model: Mainship 30 Pilot II since 2015. GB-42 1986-2015. Former Unlimited Tonnage Master
Join Date: Oct 2007
Posts: 4,984
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First I would soak the bared wood in CPES. I am not expert in the sealing of glass, but I am sure you will hear from some how are more informed. I hear the words butyl tape bandied about a lot on this topic.
__________________
Rich Gano
FROLIC (2005 MainShip 30 Pilot II)
Panama City area
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11-01-2020, 06:16 PM
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#3
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Veteran Member
City: Sturgeon Bay, Wisconsin
Join Date: Sep 2019
Posts: 54
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Thanks! I thought about epoxy, I was thinking of finishing with cetol natural teak and gloss, does epoxy play okay cetol? And I agree that it doesn't look as great, but we have two young kids so work time is limited at this point.
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11-01-2020, 06:48 PM
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#4
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Guru
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
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We use SikaFlex 291.
There is another sealer that is known to be compatible w teak. I think the chronic problem is oil ... teak oil. You may benefit from using a teak cleaner where surfaces come together that may leak.
Our teak fwd. hatch is covered most all the time. After attempting to seal it 3 times and still it leaks the cover is’nt so bad.
One could always make a fir hatch cover. And it almost certainly would’nt leak. With cherry stain I would like it.
__________________
Eric
North Western Washington State USA
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11-02-2020, 01:13 PM
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#5
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Veteran Member
City: Sturgeon Bay, Wisconsin
Join Date: Sep 2019
Posts: 54
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What about if I added some sort of mechanical retention to apply constant pressure on the glass, I wonder if I would have better luck with that paired with a sealer rather than an adhesive. I'm picturing some sort of bolt held clamp... I would have to get creative on how to dress it up...
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11-02-2020, 01:19 PM
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#6
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Veteran Member
City: Sturgeon Bay, Wisconsin
Join Date: Sep 2019
Posts: 54
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Maybe something like this:
https://www.rockler.com/glass-retainer
Quote:
Originally Posted by floatingmick
What about if I added some sort of mechanical retention to apply constant pressure on the glass, I wonder if I would have better luck with that paired with a sealer rather than an adhesive. I'm picturing some sort of bolt held clamp... I would have to get creative on how to dress it up...
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11-02-2020, 03:14 PM
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#7
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Guru
City: Beverly Hills
Join Date: Feb 2012
Posts: 1,371
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Your hatch is similar to a butterfly hatch common to wooden boats. I think you could do a search and find information on sealing the glass at those sites. Some cover constructing a hatch and may cover glass sealing.
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11-02-2020, 03:20 PM
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#8
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,185
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I used Sika 291 3 years ago to seal the teak toerail to the fiberglass deck. I used their primer first on the teak because I wanted it to stick and last. Primer was $80 and goes bad after a year on the shelf but it did work. So far there hasn’t been any that has come loose.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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11-02-2020, 03:30 PM
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#9
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Member
City: Fort Myers Beach, Fl
Vessel Name: Annie Sez
Vessel Model: Krogen 42
Join Date: Mar 2018
Posts: 9
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I have a forward hatch made of teak with a cast acrylic lens that was leaking badly. The lens also had no mechanical fastening. After following some discussions on wood boat forums , it seemed to come down to a Sikaflex product or Dow Corning 795 adhesive sealant. The Sikaflex required 2 different primers for the teak and the acrylic, and the Dow did not require any primer so I went with that. Three years now, no leaks. YMMV
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11-02-2020, 03:53 PM
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#10
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TF Site Team
City: Saltspring Island
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 5,663
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Quote:
Originally Posted by floatingmick
Hello, I need advice on sealing the forward hatch on my boat. I have stripped the varnish and removed the glass and am now attempting to plan on how to seal the glass. It has always had a terrible seal around the glass, leaking during rain or big seas and has therefore always been covered by canvas. The angulation is about 14 degrees which I believe allowed enough water to sit and work it's way through. My hope is that I can achieve a good enough seal to be able to leave the hatch uncovered. My first thought was a 3m 4200, but I don't think it plays well with glass. The design of the hatch has the glass sitting in a well without mechanical retention. Anyone have any advice on how to seal the glass to the teak frame and finally achieve a waterproof hatch?
I appreciate the help!
Gratuitous picture below. Attachment 109502Attachment 109503
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I have three hatches identical to yours. I recently replaced a broken pane of glass in one. I used Sika 291 to seal the glass and it doesn't leak.
__________________
Keith
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