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  1. #1

    Join Date
    Nov 2018
    Bensalem, PA, USA

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    Default GE Silicone 1 FYI

    0 Not allowed!
    A lot of people have been asking about silicone for the aquariums. Going by the many recommendations across the internet I used GE 100% Silicone 1. After someone pointed out to me the under the instructions it says "Not for underwater/aquarium use", for my own peace of mind, I contacted Momentive (manufacturer who makes it for GE). Their response was: "We would recommend removing the silicone. It is not designed for aquarium/below water line use because it may fail when submerged for continual use and harm your fish". What they mean by fail, I don't know, breakdown, crumble, lose adhesion? Since it's not in a critical area (used to glue a divider in a tank), I'm going to just keep an eye on it, but I will not be using it again in any of my aquariums. Take it or leave it, this is my opinion.

  2. #2

    Join Date
    Apr 2013
    Southeast Texas

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    0 Not allowed!
    Thanks for sharing your experience with this product.
    10 Gallon Beginner Tank... Journal
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    “If there are no dogs in Heaven, then when I die I want to go where they went” - Will Rogers

  3. #3

    Join Date
    Jun 2012

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    1 Not allowed!
    I suspect the failing portion is that your tank will leak eventually when used for the outside panels due to the water pressure. I don't see an issue with using it for dividers, decoration, etc, as long as you let it cure for 2 weeks (1 week is really pushing it). The Momentiv RTV1000 series is made to keep glass side stuck together as the water of your tank tries to push out.

  4. #4

    Join Date
    Mar 2012
    Quebec, CA

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    2 Not allowed!
    A lot of times, they say this for liability reasons. If it fails and a fish chokes on a piece, they don't want the aquarist to sue them. It's the same with using water conditioner products from different companies simultaneously. The companies always say they haven't tested the competitors product.

    Pretty sure 100% silicone is 100% safe, just I wouldn't be advertising it for aquariums that can fail due to consumer misuse or whatever, just too much margin for error when you don't know what you are doing to cover everyone.

    I used it in my tank to secure a rock cave. The silicone is always visible, so don't use too much and eventually it came loose the way I did it. I didn't leave it cure for 2 weeks. But I can't see a difference in the silicone itself from silicone sold for aquatic purposes.
    Last edited by angelcraze2; 01-11-2019 at 06:34 PM.
    GiVe Me sHrEd TiLL i'M dEaD

  5. #5

    Join Date
    Oct 2010
    inland northwest, U.S.A.

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    0 Not allowed!
    I got some silicone that was specifically for aquarium use, and I used it to attach some small, decorative rocks to a plant base. It stunk to high heaven for awhile, and I did let it cure for the amount of time they said to, and it still didn't adhere very well. It was a bear to work with, too. I sure wouldn't have tried to use it to seal a tank, even though it was supposed to be for that purpose.

    Even following instructions, and using the "right" product, these things can be iffy. I would never use anything that specified it's not for aquarium or underwater use, even if they only say so to prevent liability. If they say don't use it, I don't. But I've found that even when they say you can, it still may not work very well.
    20 gal. high: planted; 5 white cloud minnows, 4 golden White Clouds, several RCS, 2 blue shrimp, 5 Amano shrimp, several snails; Azoo air. 65 gal: planted; 6 rosy barbs, 6 yellow glofish, 3 red glofish, 3 zebra danios, 5 white cloud minnows, 3 dojo loaches, 6 crimson spot rainbow fish, 12 large Amano Shrimp, several snails; AC110.

  6. #6

    Join Date
    Apr 2015
    Albuquerque, NM

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    2 Not allowed!
    Silicone is not soluble in water. It will not break down when submerged. That is the whole reason it is used for constructing/sealing the vast majority of modern aquariums.

    As Kat said, the statement on the packaging is there as a disclaimer to protect themselves in the event that a person does not use the product responsibly and does a poor job at sealing/constructing their aquarium and then wants to blame someone else when their poor craftsmanship results in a structural failure.

    There are thousands and thousands of reefers, including myself, who use GE 100% Type 1 for the construction of a lot of their saltwater setups and have zero issues. It is by far the most-used silicone in the aquarium community. It does not break down when submerged, even in saltwater. Using it to secure dividers and baffles in tanks/sumps is completely safe because the water pressure is essentially equal on both sides of the baffles, plus or minus a small difference due to water flow.

    That being said, if you want to build a really large glass aquarium that holds 100+ gallons of water, I would personally use a more adhesive silicone like RTV100 that is much more tacky and can easily support 1000+lbs of water pushing on the walls of the tank.
    Last edited by BluewaterBoof; 01-11-2019 at 08:25 PM.

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