[Public-list] thickness of large portlights

[Mike Lehman]

J

We have used 1/4" plexiglass with great success. 3/16" [original] is too 
thin. I have used GE 35-years clear silicon and it works great for 25+ 
years. It is the only place on the boat that I would consider using silicon. 
We done this job to dozens of boats. No sense in re-inventing the wheel. If 
I was planning a lot of off-shore sailing, I would change to lexan for the 
extra strength.



Mike Lehman
~~~_/)_/)~~_/)~~~




----Original Message Follows----
From: "J Bergquist" <jbergqui at gmail.com>
Reply-To: Alberg 30 Public List -- open to all 
<public-list at lists.alberg30.org>
To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org>
Subject: [Public-list] thickness of large portlights
Date: Tue, 1 May 2007 14:15:39 -0400

What is the thickness for the large portlights in the cabin? I
replaced the port side ones already with 3/16" Acrylite FF (which I
think is Lexan). I am going to do the STBD ones now, but I need to
know what thickness to get. When I did the port ones, I remember
thinking that 3/16" was too thin, but it was what I had.

I was thinking 1/4" or maybe 5/16". Help appreciated.

Also, what kind of material is the best thing to use? Polycarbonate?
Lexan? Are those the same thing? Plexiglass? I have found several
different kinds of clear acrylic at www.mcmaster.com. Would appreciate
any insight into what, exactly, is the best thing to use.

Finally, what kind of caulk is the best? I have heard that butyl
rubber is the thing to use with Lexan because polysulfide will react
with it in some unfavorable way...

Thoughts welcome!

J Bergquist
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