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Old 02-12-2020, 13:39   #1
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Sealant to install toughened glass with no screws

I have a plastic cat, the toughened glass windows both sides of the coach house are fitted into a rebate using an adhesive sealant, no screws. The boat was built in 2006 and has developed a small leak in one window, the adhesive used is black and could be sikaflex but I doubt it. I donít want to remove the window so I was thinking of digging out the sealant around the leak and reseal that area. What would have been the original sealant and what sealant would I use to spot repair?
Any advice would be greatly appreciated.
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Old 02-12-2020, 14:10   #2
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Re: Sealant to install toughened glass with no screws

This, it’s used to adhere windows in skyscrapers, it’s extremely flexible, I mean extremely flexible.
https://sweets.construction.com/swts...448/254876.pdf
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Old 02-12-2020, 14:11   #3
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Re: Sealant to install toughened glass with no screws

Dow 795 silicone is what will be recommended. Lots of recent threads here on it. I have had good luck with the black RTV silicone that comes in small tubes but doubt it as good as the Dow 795.
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Old 02-12-2020, 19:03   #4
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Re: Sealant to install toughened glass with no screws

I used Fixtech which I think is used to glue car windscreens in place


https://www.fixtech.com.au/
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Old 02-12-2020, 19:48   #5
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Re: Sealant to install toughened glass with no screws

Quote:
Originally Posted by Popeye46 View Post
I have a plastic cat, the toughened glass windows both sides of the coach house are fitted into a rebate using an adhesive sealant, no screws. The boat was built in 2006 and has developed a small leak in one window, the adhesive used is black and could be sikaflex but I doubt it. I donít want to remove the window so I was thinking of digging out the sealant around the leak and reseal that area. What would have been the original sealant and what sealant would I use to spot repair?
Any advice would be greatly appreciated.
Use NP1 or OSI one part urithane structural sealant, 3/8 inch bead or larger.
Then forget about it for 20 years.
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Old 03-12-2020, 10:21   #6
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Re: Sealant to install toughened glass with no screws

I called Island Packet and they only use Silpruf. Spoke to the top rep in the country and states they've been using it on skyscrapers for 40 years. Huge windows, no fastenings.

My 1st attempt failed miserably. 2nd attempt I used 1/8" spacers (you buy these from the professional construction stores) and put those on so squeeze out is impossible. Then I put on a 3/8 double bead. Some of that bead squeezed out. Using a sponge, wet, takes care of that.
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Old 03-12-2020, 10:32   #7
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Re: Sealant to install toughened glass with no screws

I recently asked similar question. This technical guide from Sika was helpful.

https://dnk.sika.com/dms/getdo...Bon...pplication.pdf

That said, I tried calling sika and was unable to contact the right person or department.

Good luck

Peter
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Old 03-12-2020, 12:20   #8
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Re: Sealant to install toughened glass with no screws

I would guess it is not what you use it is your prep digging out the old stuff.
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Old 03-12-2020, 12:58   #9
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Re: Sealant to install toughened glass with no screws

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Originally Posted by Cadence View Post
I would guess it is not what you use it is your prep digging out the old stuff.


Good point, thatís why Iíd like to know the sealant used by the builder. My boat is a Perry 43 passagemaker built 2006 by Bryan Perry on the Gold Coast QLD. Fortunately I knew Bryan and would regularly ask him questions about the boat, he was a great guy and his boats are a credit to him. However he passed away last year so we lost an icon of the boating industry in Australia.
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Old 03-12-2020, 13:01   #10
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Re: Sealant to install toughened glass with no screws

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Originally Posted by Cpt Mark View Post
I called Island Packet and they only use Silpruf. Spoke to the top rep in the country and states they've been using it on skyscrapers for 40 years. Huge windows, no fastenings.

My 1st attempt failed miserably. 2nd attempt I used 1/8" spacers (you buy these from the professional construction stores) and put those on so squeeze out is impossible. Then I put on a 3/8 double bead. Some of that bead squeezed out. Using a sponge, wet, takes care of that.


Thanks for the info, by a wet sponge I take it you mean water.
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Old 03-12-2020, 13:04   #11
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Re: Sealant to install toughened glass with no screws

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Originally Posted by atlroofman View Post
Use NP1 or OSI one part urithane structural sealant, 3/8 inch bead or larger.

Then forget about it for 20 years.


Pardon my ignorance but what is NP1 or OS1
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Old 03-12-2020, 13:29   #12
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Re: Sealant to install toughened glass with no screws

Dow 795
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Old 03-12-2020, 15:03   #13
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Re: Sealant to install toughened glass with no screws

Quote:
Originally Posted by a64pilot View Post
This, itís used to adhere windows in skyscrapers, itís extremely flexible, I mean extremely flexible.
https://sweets.construction.com/swts...448/254876.pdf
I've seen a glass panel on a commercial building replaced, about 8' x 12'. No mechanical fasteners. The above may be worth looking into. It amazed me.
It might be over kill?
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Old 03-12-2020, 16:19   #14
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Re: Sealant to install toughened glass with no screws

We have a Perry 43 cat as well. I need to replace a window section on the port coachroof (1 toughened panel covers 2 window apertures) and also partly seal another window, like you.

The glass used is from G James at Eagle Farm, Brisbane. When we bought the boat, one of the conditions of sale was to replace a couple leaking hatches. Bryan and his boys used Fixtech (maybe #200).

There is a very good article in thecoastalpassage magazine (how to install boat windows and port lights) They recommend using Dow Corning #791, which may be a better product.

You may be interested in the new Perry Catamaran Owners Group which has just recently been set up on Facebook.

Cheers
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Old 03-12-2020, 17:11   #15
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Re: Sealant to install toughened glass with no screws

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Originally Posted by Redfred1 View Post
We have a Perry 43 cat as well. I need to replace a window section on the port coachroof (1 toughened panel covers 2 window apertures) and also partly seal another window, like you.



The glass used is from G James at Eagle Farm, Brisbane. When we bought the boat, one of the conditions of sale was to replace a couple leaking hatches. Bryan and his boys used Fixtech (maybe #200).



There is a very good article in thecoastalpassage magazine (how to install boat windows and port lights) They recommend using Dow Corning #791, which may be a better product.



You may be interested in the new Perry Catamaran Owners Group which has just recently been set up on Facebook.



Cheers


I have a slight leak on the stb top aperture so I just want seal around the top of that aperture, however I am hesitant to use any sealant until I am sure itís compatible with the existing sealant. I may have to look into a primer. Thanks for the tip about the Perry Cat facebook site.
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