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Old 03/07/2008, 07:18 PM   #1
insanefishguy
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what to use to attach plastic to glass

ok, so I am currently in the process of setting up a 125. I had the tank drilled, so the holes are on the back pane. In order to maximize my surface skimming without being to obtrusive, I made two "overflows" out of a cutoff section of a black polypropelene catch basin tub from lowes. Being the dipstick that I am sometimes, I figured I could just silicone them in place over the holes. I know that I have read many times that silicone will not hold acrylic to glass, but I just didnt think about it. Can I use an epoxy or superglue to hold them in place? Or mabe gorilla glue? Does anyone know if that is safe?


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Old 03/07/2008, 07:20 PM   #2
insanefishguy
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right now they are siliconed on the back pane, and I have to say that it seems like they are really stuck fast. If I am not mistaken it is the expanding and/or contracting at different temps that causes the failure between plastics and glass with silicone


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Current Tank Info: 335 total gallon system: 125 mixed reef under HO t5'S, 40g fuge, 75g frag tank, 55g sump, and 40g water change reservoir
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Old 03/07/2008, 07:33 PM   #3
YankyTexan
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GE makes a product I purchased at Lowes. It is a red 2.8 oz. tube titled:

100% Silicone Sealant for Lexan sheet & other plastics.

I used it in my DIY to adhere acryllic to glass. It forms a very strong bond.


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Old 03/07/2008, 07:36 PM   #4
insanefishguy
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hmmmm also silicone? I know exactly what you are talking about. I worked in lowes for over a year.


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Current Tank Info: 335 total gallon system: 125 mixed reef under HO t5'S, 40g fuge, 75g frag tank, 55g sump, and 40g water change reservoir
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Old 03/07/2008, 09:39 PM   #5
FFrankie
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I used CR LAURENCE CRL Clear Aquarium Silicone Sealant with great results when i installed my coast to coast overflow. I clamped the plastic tight in place with a thin bead only on the edge. Then when cured I went back and gave it that factory edge look. Remember that Silicone takes up to two weeks to fully cure.


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Old 03/08/2008, 06:05 AM   #6
YankyTexan
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Prepping each surface properly as well as allowing optimal time for curing (as FFrankie said) is crucial to the success of the job. I let mine cure 7 days.


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Old 03/08/2008, 04:11 PM   #7
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I use super glue in my tanks alot. Never any problems.


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Old 03/08/2008, 05:13 PM   #8
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thanks guys. I didnt know that silicone took two weeks to fully cure. It has been sitting about a week now, I guess I can wait a little longer.
Any thoughts on running some puper glue along the inside edge just to add some strength? I figure if the silicone is holding the glass properly then maybe the super glue will at least help adhere the plastic and the silicone, but maybe Im being foolish.


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Old 03/10/2008, 08:46 AM   #9
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I have previously found that Goop makes a very strong bond between glass and acrylic. As far as gluing polypropylene though, I couldn't say. All plastics are different. Some, such as polyethylene, can't be glued at all.

Allen


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Old 03/10/2008, 08:52 AM   #10
ReeferAl
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I found some information
here
on gluing, or rather the inability to glue, polyethylene and polypropylene.

Quote:
Cyanoacrylate, epoxy, polyurethane, silicone (RTV for example), and most acrylic adhesives do not stick to polypropylene and polyethylene.
That link also shows a new adhesive that supposedly will work, Scotch-weld DP 8005. HTH

Allen


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Old 03/10/2008, 01:31 PM   #11
insanefishguy
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Interesting, but disappointing. I dont know what I am going to do. SO far, they are still in place. I have really pulled on them and they have not budged. I suppose I should make something better before I move all my stuff into the tank, but I want so badly to just see what happens and be optomistic.


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Current Tank Info: 335 total gallon system: 125 mixed reef under HO t5'S, 40g fuge, 75g frag tank, 55g sump, and 40g water change reservoir
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Old 03/10/2008, 03:14 PM   #12
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My tanks been running for a while with silicone holding it. LOTS of silicone, it's almost acting as rim for the perspex to push against.

I also fill the overflow first (have a durso) to provide a bit of support against the pressure of the tanks water (minimal help I know but makes me feel better


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Old 03/10/2008, 08:52 PM   #13
ReeferAl
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If it's just holding an internal overflow in place then silicone would probably suffice as it doesn't have to be that strong and a failure would not be catastrophic. OTOH, if you were attaching an external overflow then I would definitely use the "proper" glue.


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Old 03/10/2008, 09:33 PM   #14
leebo_28
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my 90 overflow is sealed from factory with silicone..i think it more or less wedges it there with enough silicone to seal it too


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Old 05/21/2020, 08:34 AM   #15
Ritesh
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Guys I'm trying to make a little fish tank by gluing a glass panel to a plastic container. Can I use solid in or superglue . Which one is better.


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