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Go Back   SailNet Community > On Board > Gear & Maintenance > Leaking Window-Hatch
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Thread: Leaking Window-Hatch Reply to Thread
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Topic Review (Newest First)
08-31-2013 08:16 AM
jeepjeff
Re: Leaking Window-Hatch

Regarding using DC795 sealant (caulk) for sealing the windows. In my previous career I ran a global pilot plant for the sealants business at Dow Corning for about 12 years, and made tons of Silicone and Acrylic Sealants. DC sealants are also bought by DAP and numerous other suppliers and packaged under their own brand names. The key to this working is that it is an "acrylic" sealant with anti-fungal agents.

Almost any acrylic sealant will work however you MUST make sure it is for use in wet areas. Most are labeled as anti-fungal (mold resistant) but any bathroom acrylic will work. Most aquarium manufacturers use the clear acrylic version to seal theirs. You can easily tell if it is acrylic by smelling it, yup - just smell it. If it has a very strong "vinegary" smell then you have the right stuff.

A little late to help the OP out but figured I put this out there as well as offer my assistance for any future questions regarding sealants.

Edited to add that the best acrylic type sealants use an "Acetoxy" curing agent for their strength.
06-14-2013 01:13 PM
TheTardis
Re: Leaking Window-Hatch

Quote:
Originally Posted by dvuyxx View Post
Sorry, Tardis ... I didn't see your post at first. I have the Bomar High Profile hatch, Bomar is currently selling a 2000 series that looks pretty similar even 34 years later. Yup, I think that sounds like what I have to do as well. Were you able to lift out the lens simply by digging out the caulk from the outside?
Yes, I was able to completely remove the lens. Head over to this link: Red Lady's New Ride - Cruising Anarchy - Sailing Anarchy Forums

I documented the entire process. You should find it on the first page of the thread toward the bottomw. I hope that is helpful!

Jess
06-14-2013 12:36 PM
Faster
Re: Leaking Window-Hatch

The hatch experts (Select Plastics) recommend DC795 as the sealant/adhesive of choice for this kind of job.

Select Plastics, LLC: Marine Hatch Repair
06-14-2013 11:49 AM
dvuyxx
Re: Leaking Window-Hatch

Quote:
Originally Posted by TheTardis View Post
Which Bomar hatch do you have? I have an old one with a metal frame and a plexi lens over my v-berth on my P-30, and when I first bought the boat it would flood the v-berth when it rained. I did the hose test on a dry day...have a dockmate hold the hose while I went below to check for ingress. For me, the water was coming in between the plexi and the frame. I spent a few hours one afternoon and removed the old silicone that was holding the lens in place, removed and cleaned the lens and the frame and used 3M 4000 in black inside and out. No leak since...not even last night with all the rain we had. If you haven't done so yet, have someone stand topside and run a hose over the hatch and observe where the water is entering.
Sorry, Tardis ... I didn't see your post at first. I have the Bomar High Profile hatch, Bomar is currently selling a 2000 series that looks pretty similar even 34 years later. Yup, I think that sounds like what I have to do as well. Were you able to lift out the lens simply by digging out the caulk from the outside?
06-14-2013 11:34 AM
dvuyxx
Re: Leaking Window-Hatch

So, I took advantage of a heavy rain to see from where the leak orignated on this hatch. I can tell from the weeping water that it is actually the glazing around the lens/glass, not the gasket seal.

Would the next step to be to completely cut out the glazing (seems like a silicone caulk) and then re-glaze? I'm looking on the web now for some how-to demos.

You can see from this photo (if you look closely) that the caulking is compromised around the corner.

[IMG][/IMG]
06-11-2013 09:41 PM
TheTardis
Re: Leaking Window-Hatch

Which Bomar hatch do you have? I have an old one with a metal frame and a plexi lens over my v-berth on my P-30, and when I first bought the boat it would flood the v-berth when it rained. I did the hose test on a dry day...have a dockmate hold the hose while I went below to check for ingress. For me, the water was coming in between the plexi and the frame. I spent a few hours one afternoon and removed the old silicone that was holding the lens in place, removed and cleaned the lens and the frame and used 3M 4000 in black inside and out. No leak since...not even last night with all the rain we had. If you haven't done so yet, have someone stand topside and run a hose over the hatch and observe where the water is entering.
06-11-2013 02:29 PM
dvuyxx
Re: Leaking Window-Hatch

I bought it from Maine Sail/Compass.

Yeah, I have some similar stuff that I've used for window work awhile ago ... but it does not look or behave like the one in MaineSail's butyl how-to (which is awesome by the way).

I'm going to butyl the outside at the deck surface and see if that is good temporary fix. The upper gasket seal looks tight to me, but you never know.
06-11-2013 01:09 PM
QuickMick
Re: Leaking Window-Hatch

If you use butyl (you can also get it at rv shops) I would put some on the outside of the hatch as well, as if you only block the inside water may still be getting inbetween and could get h20 in the deck. I used it as a temp fix until I replaced them and it worked pretty well.
06-11-2013 12:48 PM
asdf38
Re: Leaking Window-Hatch

Quote:
Originally Posted by johnnyquest37 View Post
What's the difference between marine grade butyl and the stuff you can get at Home Depot for sealing windows, doors, etc.?
Butyl tape is basically a generic term, like Epoxy or Silicon sealant. There are millions of formulations of each (almost literally).

The stuff MaineSail sells is the ideal formulation (very flexible, very sticky) and shape (flat) for use bedding marine hardware.

I tried two other types before buying from Mainsail here on sailnet (see the butyl tape thread) and both were not quite right. Not nearly as sticky or flexible. For $30 bucks you can get the best stuff, I suggest doing it.
06-11-2013 12:41 PM
johnnyquest37
Re: Leaking Window-Hatch

What's the difference between marine grade butyl and the stuff you can get at Home Depot for sealing windows, doors, etc.?
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