[PSUBS-MAILIST] Veiwport sealing

[greg cottrell]

Just a short commercial about 295 UV-
 
The first forward dome in my sub was bedded in 5200 urethane by 3m (which is advertised as a marine sealant and used for acrylic ports on boats). About two years went by and I noticed that the seal looked different. So I removed the retainer and the dome literally fell out in my hands!  Wasn't expecting that! Luckily I caught it before it hit the ground. The surface of the 5200 was perfectly smooth but it had lost all adhesion to the acrylic. It looked like a rubber gasket.
 
I then removed all of the 5200 and re installed the dome with 295-UV (and the black primer that goes with it).
The dome spent the next ten years installed with lots of dives and no problems.
Eventually, because of its age, I decided to make a new one to replace it (although it still looked like new). I tried to push the old dome out with a 4 x 4 and a hydraulic jack from the inside. It wouldn't even budge. I pushed it so hard that the 4 x 4 was starting to split! The dome wasn't even phased! After a couple of hours I finally took out the recipro saw and cut the dome into radiating pieces to try to pry them out one at a time. Using a crowbar, the acrylic was breaking into pieces but broken shards were still stuck the sub! It took quite a few hours to remove the sikaflex- mostly with wood chisels (heated with a torch) and a wire wheel.
 
So, all I can say is that if you install your domes or ports with 295-UV those ports are NOT coming out without a lot of effort!
 
Greg
 
 


________________________________
From: "MerlinSub at t-online.de" <MerlinSub at t-online.de>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Friday, September 13, 2013 2:24 PM
Subject: Re: [PSUBS-MAILIST] Veiwport sealing



  http://www.svb24.com/en/sikaflex-295-uv-adhesive-for-plastic-window-panes.html

vbr carsten 

"swaters" <swaters at waters-ks.com> schrieb: 
Where do you buy the material you use to seal veiwports? I have heard everyone saying sikaflex but there are alot of different kinds of sikaflex and the one west marine sells says it is not compatible with plexiglass. Help?
>Thanks,
>Scott Waters
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>Sent from my U.S. Cellular© Smartphone 

-- 

Carsten Standfuß
Dipl.Ing.Schiffbau @ Meerestechnik
Heinrich Reck Str.12A
18211 Admannshagen

0172 8464 420
WWW.Euronaut.org
Carsten at euronaut.org
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