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Sealant for acrylic windows


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5 minutes ago, Dtwo said:

It doesn't sound like you have ever used Silicon, it has absolutely no place on a boat these days.

Wrong. I used it on my boat and it was absolutely fabulous on all the windows and chain plates after the muck the boat builder used leaked like a sieve the first time it rained.

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Silicon is the best sealant, Dow Corning 795 is commonly used but modified silicones (MS) are produced by a number of companies, Quilosa MS 35 is quite cheap compared to the big names and seems pretty good..  The trick is in the prep and reading the tech sheets, in particular the minimum bead thickness and surface prep for your application. 

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50 minutes ago, Tamure said:

Silicon is the best sealant, Dow Corning 795 is commonly used but modified silicones (MS) are produced by a number of companies, Quilosa MS 35 is quite cheap compared to the big names and seems pretty good..  The trick is in the prep and reading the tech sheets, in particular the minimum bead thickness and surface prep for your application. 

Yes as I mentioned earlier I feel there are probably several very good products around nowadays, especially when compared to decades ago when a lot of our boats were built! Forums like this are great for me being a newbie to use the experience of others to help make good choices and reduce the risk of mistakes. All very helpful stuff. I am confident I will have a watertight boat soon!!!

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I think people are forgetting how wide the term "Silicone" goes.
Dow Corning 795 is the go to adhesive for windows, Glass, Perspex, Polycarbonate etc - it works on it all and is awesome.
Selleys All Clear - not so much... 

Each adhesive has its use cases and they are normally designed for a use case. A blanket rule saying no silicon on a boat is crazy.

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Slightly off topic but still window related, peoples views on tint? Is it a must or just personal preference? My original windows were clear so I got clear acrylic but could get some stick on tint and apply before fitting the windows I guess?

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If your going to tint the Acrylic just make sure the film is compatible otherwise your going to end up in a world of hurt!! Bubbling and pealing within a very short space of time.

My thought's is tinted window's are better due to the privacy and heat reduction benefits. (I'm a window tinter by trade) and would add a film on my own boat in the future. Glass is so so much easier though.

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Side windows yes to tinted. Just a nicer look i think too from the outside.
In the launch (Darn can i say that word here) - clear in the front, tinted is a bugger to see out of at night when driving inside.

Or on the  Smoke wagon the windows are non existent (Or one could say heavily tinted white fibreglass colour)... If you go downstairs on it, your not there for the view and dont wanna spend too long!

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11 hours ago, Swartch said:

If your going to tint the Acrylic just make sure the film is compatible otherwise your going to end up in a world of hurt!! Bubbling and pealing within a very short space of time.

My thought's is tinted window's are better due to the privacy and heat reduction benefits. (I'm a window tinter by trade) and would add a film on my own boat in the future. Glass is so so much easier though.

Ok. So is there a way to identify if the tint is comparable with the acrylic or not, it should say on the packaging? Put tint on after windows are fitted or prior to?

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Most major manufacturers have a safe product to use, looking at my sample books they may have changed to using clear only which will make it more difficult. I would suggest calling a few of the suppliers and asking what they have. I personally wouldn't use any of the cheap products from Repco, Supercheap and online as you really don't know what your getting. As for install it depends on how they are mounted ie: from the inside in which case it doesn't matter and from the outside you will need to leave a clear area around the edge for the adhesive to bond.

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23 hours ago, Black Panther said:

D2 what do you use for fitting deck hardware these days?

4200 mostly.  I used to like the old polysulphide but it seems to have gone out of favour.

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5 minutes ago, Island Time said:

Bed it tape for deck hardware. Works great, never sets, and is removable and waterproof.

Is there a specific tape you use? Can be sourced in NZ? I also have some deck hardware I want to re seal.

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The screws besides being a source of leaks also are stress points when the hull flexes and will often end up starting cracks in the acrylic -if you have a good bed of sealant there is no need for the screws although a couple to keep the window in place and lined up while the sealant cures can be a good idea - screws to be removed in and filled in after .

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9 hours ago, Tamure said:

Head to the plumbing supplies, grey butyl tape aplenty!

There are lots of versions. They can be very different. You may be able to source something similar, and it may or may not work as well.

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Bed it tape is not just butyl:

“ Please be aware however that Bed-It Tape is not a "butyl tape" it is a hybrid product with butyl in the mix. We only use the term "butyl" because many folks are aware of that consistency wise.. Bed-It Tape was formulated by Compass Marine Inc. in partnership our manufacturers lab. “

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