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Old 02-01-2023, 13:09   #1
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Replacement gasket material for portlight?

Hi,

I have an old round portlight with a questionable gasket for the glass itself.

I would like to replace the gasket. Note, I am not talking about the gasket which is visible when it's open, but of the white gasket sealing the glass.
As far as I can see the round retaining ring with the two round marks can be unscrewed to free the glass. Might need to use some weasels piss to do that.

But than, and that is the question, I need some gasket material out of which I can cut a new gasket for the glass.

What should I get for this?
Silicone sheet material? Rubber sheet material?

I'll start polishing and unscrewing once I'm sure I have a good gasket material.

Thanks for suggestions. Click image for larger version

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Old 03-01-2023, 00:47   #2
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Re: Replacement gasket material for portlight?

To add to the material choice, I can get PTFE or Silicone sheet material also.

Just wondering what would be lasting the longest time.
Suggestions?

The hatch is mounted under the bridgedeck and occasionally awash.
I have some similar hatches on deck and they are absolutely watertight.
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Old 03-01-2023, 03:09   #3
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Re: Replacement gasket material for portlight?

On mine, which are similar, the glass is bedded with putty. When I replaced one, I used silicone like for ordinary windows. Been leak-free for almost ten years.
You can clean it up with xylene (and it's a good idea to clean the glass itself with xylene before installing).
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Old 03-01-2023, 04:31   #4
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Re: Replacement gasket material for portlight?

Quote:
Originally Posted by Benz View Post
On mine, which are similar, the glass is bedded with putty. When I replaced one, I used silicone like for ordinary windows. Been leak-free for almost ten years.
You can clean it up with xylene (and it's a good idea to clean the glass itself with xylene before installing).
Great. Thank you.

Few more questions [emoji846]

1)
Is my assumption correct that the full diameter retaining ring is screwed in?
2)
How did you apply the silicone on yours?
Bead on part 1, drop glass in, bead on glass, screw retaining ring in while wet?
3)
Did you screw the retaining ring in to the max while the silicone was still "wet", or did you fully tighten it when it was cured to make sure that a certain thickness of silicon was achieved?
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Old 03-01-2023, 09:20   #5
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Re: Replacement gasket material for portlight?

Part 1
I can answer now myself, after soaking it came readily apart.

So now dear Benz the question regarding Silicon above are left for comment. Appreciate it if you can help with that.
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Old 03-01-2023, 11:52   #6
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Re: Replacement gasket material for portlight?

It was: bead of silicone on frame; drop in glass, screw in ring tight all at once. I feel that if you let the silicone partly dry and screw some more it just gets weird squeeze-outs.
So, only one bead--I didn't want silicone all over the inside--and tighten down at once.

You might lube the threads on the ring so they tighten nice and easy.
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Old 03-01-2023, 12:23   #7
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Re: Replacement gasket material for portlight?

Quote:
Originally Posted by Benz View Post
It was: bead of silicone on frame; drop in glass, screw in ring tight all at once. I feel that if you let the silicone partly dry and screw some more it just gets weird squeeze-outs.
So, only one bead--I didn't want silicone all over the inside--and tighten down at once.

You might lube the threads on the ring so they tighten nice and easy.
Thanks. Will do like this. Next step elbow grease to polish it back to pretty [emoji846]
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Old 04-01-2023, 15:03   #8
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Re: Replacement gasket material for portlight?

Polish the frame before you put the glass in.
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Old 04-01-2023, 15:03   #9
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Re: Replacement gasket material for portlight?

Quote:
Originally Posted by Fortytwo View Post
Polish the frame before you put the glass in.
Absolutely.
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Old 04-01-2023, 15:44   #10
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Re: Replacement gasket material for portlight?

Glass can be difficult to seal to. Many sealants will require a primer to seal to glass. Dowsil 795 is used to install windows in buildings, without any additional mechanical fasteners, and without primer. It is available on Amazon and pretty cheap. I used it on my acrylic hatches with great success after 3m and sikaflex products sold for that purpose failed.
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Old 04-01-2023, 17:48   #11
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Re: Replacement gasket material for portlight?

The acetic acid in silicone is not kind to bronze, and you most certainly do not want any kind of sealant on the threads of the retaining ring.
Before I would try any messy stuff in a tube I would take the portlight to a place that specializes in seals and O-rings.
The sizes/thicknesses and durometer ratings are almost limitless.
You might find something that will work just fine and forgo a bunch of gooey work, plus, now you have a part # for future replacement if needed.
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Old 18-06-2023, 06:49   #12
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Re: Replacement gasket material for portlight?

I need the rubber like flexible gasket seal that sits in a groove on the glass part of the porthole.
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Old 18-06-2023, 08:17   #13
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Re: Replacement gasket material for portlight?

After all we just got flat 3mm rubber sheat and cut a new seal.
No sealent needed. Just the new rubber gasket against the glass.
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Old 28-06-2023, 06:29   #14
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Re: Replacement gasket material for portlight?

Hi Franziska,

Did you consider butyl? That' s what seals car windscreens and caravan portlights. It is sold in thin plates or in 3mm chords, stays flexible and sticky, doesn' t like direct sun, is easy to apply. Not for use in permanent salty water/ underwater.
We just seal the thruhulls over the waterline with it after new paint of the hull.
Easy and cheap to get in China...
Greetings, Rainer

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Old 28-06-2023, 07:26   #15
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Re: Replacement gasket material for portlight?

EPDM rubber is UV resistant, suitable for harsh environments, and gasket material comes in various cross sections and hardness. See, for example, this:

https://www.mcmaster.com/products/ga...dm-foam-cords/
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