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Old 12-07-2019, 08:59   #1
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Recommended sealant for glass-to-metal windshield

I need to re-seal my windshields and am wondering what everyone recommends. They are glass in aluminum frames.
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Old 12-07-2019, 09:03   #2
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Re: Recommended sealant for glass-to-metal windshield

I just did a plexi hatch in aluminum base and used Dow 795. Pretty sure thats what was originally used as it looks identical to what was in there. came highly recommended. McMaster had it for reasonable price.
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Old 12-07-2019, 09:20   #3
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Recommended sealant for glass-to-metal windshield

This sealant is I believe constructed just for that and is often used for high rise building windows. Itís apparently a very strong adhesive as itís recommended for structural glazing and recommended for ďhigh force winds and severe impactĒ
I use it to seal my chain plates as itís supposed to be the best sealant for that as in flexibility, no leaks and lasting for decades etc.
https://www.siliconeforbuilding.com/...0-SilPruf.aspx
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Old 12-07-2019, 18:54   #4
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Re: Recommended sealant for glass-to-metal windshield

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Originally Posted by a64pilot View Post
This sealant is I believe constructed just for that and is often used for high rise building windows. Itís apparently a very strong adhesive as itís recommended for structural glazing and recommended for ďhigh force winds and severe impactĒ
I use it to seal my chain plates as itís supposed to be the best sealant for that as in flexibility, no leaks and lasting for decades etc.
https://www.siliconeforbuilding.com/...0-SilPruf.aspx
Cool. I especially like that the description says that its good for "remedial" applications. AND I need to re-seal my chainplates as well. Thanx
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Old 12-07-2019, 20:44   #5
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Re: Recommended sealant for glass-to-metal windshield

I think DOW 795 is a more common recommendation, but it is probably similar to the GE product.
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Old 13-07-2019, 10:20   #6
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Re: Recommended sealant for glass-to-metal windshield

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Originally Posted by a64pilot View Post
This sealant is I believe constructed just for that and is often used for high rise building windows. Itís apparently a very strong adhesive as itís recommended for structural glazing and recommended for ďhigh force winds and severe impactĒ
I use it to seal my chain plates as itís supposed to be the best sealant for that as in flexibility, no leaks and lasting for decades etc.
https://www.siliconeforbuilding.com/...0-SilPruf.aspx



Did you use that at Thrush?
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Old 13-07-2019, 11:48   #7
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Re: Recommended sealant for glass-to-metal windshield

These products are a LOT better than Home Depot type 100% silicone products. Huge difference in adhesion.
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Old 13-07-2019, 13:20   #8
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Re: Recommended sealant for glass-to-metal windshield

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Cool. I especially like that the description says that its good for "remedial" applications. AND I need to re-seal my chainplates as well. Thanx
Dow 795 is not appropriate for chainplates. Not a good place for silicone.
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Old 13-07-2019, 19:03   #9
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Recommended sealant for glass-to-metal windshield

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Did you use that at Thrush?


No, itís what Island Packet has come to recommend for sealing their chainplates. IP has had issues with chainplates for a long time, and to be fair to them Iím sure at least some of those issues come from salt water intrusion and the corrosion associated with it.
Aircraft windshields were installed with B2 fuel tank sealer, which except for the pliability may be a better product, but most donít know what it is, and itís a little bit of a PIA to work with.
Silicone is a pretty broad term apparently, this stuff doesnít smell like vinegar for instance, some silicones donít. Silicone approved for aircraft use doesnít for example as the acetic acid is apparently corrosive to aircraft aluminum.

I used it based on IPís recommendation, they have tested just about everything over the years.
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Old 13-07-2019, 19:23   #10
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Re: Recommended sealant for glass-to-metal windshield

[QUOTE=a64pilot;
I used it based on IPís recommendation, they have tested just about everything over the years.[/QUOTE]




Just did my cockpit sole with caulking and it smelled just like the old days at a Cessna dealership. We did over 100 windshield replacements on a bunch of pressurized aircraft. Each one used a bunch of fuel tank sealant. Seems like on something that is not pressurized you could use silicone.
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Old 13-07-2019, 20:07   #11
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Re: Recommended sealant for glass-to-metal windshield

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Just did my cockpit sole with caulking and it smelled just like the old days at a Cessna dealership. We did over 100 windshield replacements on a bunch of pressurized aircraft. Each one used a bunch of fuel tank sealant. Seems like on something that is not pressurized you could use silicone.


Probably, but at Thrush B2 was used for just about everything, in truth I canít think of any other sealant being used for anything.
Even would run a bead of it around the fuel tank drain plug etc.
Except for the firewall of course used firewall sealer there, just about forgot about that.
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Old 14-07-2019, 02:52   #12
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Re: Recommended sealant for glass-to-metal windshield

Quote:
Originally Posted by a64pilot View Post
... Silicone is a pretty broad term apparently, this stuff doesnít smell like vinegar for instance, some silicones donít. Silicone approved for aircraft use doesnít for example as the acetic acid is apparently corrosive to aircraft aluminum...
Indeed.
There are numerous different types of silicone sealants, each with its own unique properties.
Formulations include: Low modulus (LMA & LMN) & High modulus (HMA & (HMN) , Acetoxy & Neutral cure, Sanitary (/w fungicide), Food-safe, High-Temperature, Other specialist silicones.
Ie: Neutral cure (neutral alcoxy) silicone sealants release alcohol as they cure, and have almost no (vinegar) smell. They have better adhesive properties, for a greater number of materials, including PVC-U, most other plastics, glass, aluminium, lead, stone and masonry and Polycarbonate. On the downside, they can be more expensive and are slower to cure at one to five days depending on thickness, temperature and humidity conditions.
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Old 14-07-2019, 15:49   #13
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Re: Recommended sealant for glass-to-metal windshield

I did a powerboat using 3m Window Weld about 3 years ago and it worked great.

https://www.amazon.com/3M-08609-Wind...gateway&sr=8-1
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