GE Silicone 1* Safe For Aquariums?

JustAFishServant
  • #1
Hello all! As some of you may know, I've been running a Betta/Invert/Nano Fish rescue for about 8 years. For awhile, I didn't have much money...or ideas, for that matter. Luckily, though, I was able to get my creativity flowing, and am now planning on several projects, such as making dividers, glass lids with custom knobs, and even my own DIY aquariums! I have all that I need; the glass has been cut, painter's tape is abundant, and the gun has been caulked (pun very much intended). I do still have to purchase a razor scraper, but that's not a problem. The biggest issue I have now is figuring out whether GE Silicone 1* is aquarium safe.

The bottle mentions that it's 100% silicone, which means without additives, yet shows a label that says "Mold-Free". This implies that the silicone has chemicals added...but that would be impossible, since it's 100% silicone and has been proven compliant for incidental food contact by the FDA, which essentially means you won't die if you lick it, but it's really not recommended. It mentions that it's non-paintable, so again, no chemicals added, and that it's 100% waterproof, which means that it is capable of keeping water in (or out). It's freeze and sun-proof, has "excellent" flexibility, and strong adhesion. It takes 24 hours to fully cure and can be exposed to water after only half that time. It's capable of holding strong in temps as low as -60°F, or as high as 400°F (-51 to 204°C). When first applied, it releases ammonia, which obviously isn't good for an aquarium unless you're trying to cycle it. However, once fully cured, fumes will not continue. As mentioned before, it's considered "7-year mold free", but if you read the small print at the bottom right, it mentions that cleaning is required, otherwise mold and mildew can still grow. Everything mentioned here suggests that it's safe for aquarium use, if you ignore the warning on the back. It's strong, reliable, cheap ($4.29 for a 10.1oz bottle at Lowe's), and all around a great alternative to normal yet much more expensive "aquarium silicones", if you ask me. Besides, if Tanner at SerpaDesign uses it for his paludariums, and my grandad has been using it since the 70's, so can we! But I'd still like to hear your opinions

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Fishnturtleguy933
  • #2
Used it to hold Lego mini figures to other lego structures in my 40 breeder. So long as you give it 24-48 hours to cure and aren't using half the tube in one go you should be fine. Others might have different experiences but i never had an issue. Tanner from serpadesign on youtube uses it in a lot of his builds.
 
John58ford
  • #3
Yeah, the packaging changed over the last year for the silicone 1. As far as I could tell it's still the same product. I don't know why they added the mold free claim TBH.
 
Sauceboat
  • #4
I've used in on quite a few aquarium building projects. Perfectly safe.
 
Fishfriendof315
  • #5
Yeah, the packaging changed over the last year for the silicone 1. As far as I could tell it's still the same product. I don't know why they added the mold free claim TBH.
Fancy way of saying no doubt waterproof
 
JimSinclair
  • #6
Hello all! As some of you may know, I've been running a Betta/Invert/Nano Fish rescue for about 8 years. For awhile, I didn't have much money...or ideas, for that matter. Luckily, though, I was able to get my creativity flowing, and am now planning on several projects, such as making dividers, glass lids with custom knobs, and even my own DIY aquariums! I have all that I need; the glass has been cut, painter's tape is abundant, and the gun has been caulked (pun very much intended). I do still have to purchase a razor scraper, but that's not a problem. The biggest issue I have now is figuring out whether GE Silicone 1* is aquarium safe.

The bottle mentions that it's 100% silicone, which means without additives, yet shows a label that says "Mold-Free". This implies that the silicone has chemicals added...but that would be impossible, since it's 100% silicone and has been proven compliant for incidental food contact by the FDA, which essentially means you won't die if you lick it, but it's really not recommended. It mentions that it's non-paintable, so again, no chemicals added, and that it's 100% waterproof, which means that it is capable of keeping water in (or out). It's freeze and sun-proof, has "excellent" flexibility, and strong adhesion. It takes 24 hours to fully cure and can be exposed to water after only half that time. It's capable of holding strong in temps as low as -60°F, or as high as 400°F (-51 to 204°C). When first applied, it releases ammonia, which obviously isn't good for an aquarium unless you're trying to cycle it. However, once fully cured, fumes will not continue. As mentioned before, it's considered "7-year mold free", but if you read the small print at the bottom right, it mentions that cleaning is required, otherwise mold and mildew can still grow. Everything mentioned here suggests that it's safe for aquarium use, if you ignore the warning on the back. It's strong, reliable, cheap ($4.29 for a 10.1oz bottle at Lowe's), and all around a great alternative to normal yet much more expensive "aquarium silicones", if you ask me. Besides, if Tanner at SerpaDesign uses it for his paludariums, and my grandad has been using it since the 70's, so can we! But I'd still like to hear your opinions
View attachment 772807View attachment 772808View attachment 772809
I'm in my local Lowe's. Do I have the right product here?

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20220411_142458_HDR.jpg

It looks like the product you're describing, but the instructions says in bold all-caps, "NOT RECOMMENDED FOR UNDERWATER/AQUARIUM USE."

So is this a fish safe product or not?
 
JustAFishServant
  • Thread Starter
  • #7
I'm in my local Lowe's. Do I have the right product here?

It looks like the product you're describing, but the instructions says in bold all-caps, "NOT RECOMMENDED FOR UNDERWATER/AQUARIUM USE."

So is this a fish safe product or not?
Yep, that's the one. It says "not safe for aquariums" but SerpaDesign and I have used it for many years without fail. Just no silicone 2 ;)
 
MrMuggles
  • #8
I used GE silicone II on my sump baffles, everything seems fine after several months.
 
JustAFishServant
  • Thread Starter
  • #9
I used GE silicone II on my sump baffles, everything seems fine after several months.
Good to know, I've seen horrible reviews of silicone II ("my corals/fish died," etc - of course that doesn't necessarily mean it's the silicone's fault). I've heard II's added antibacterial properties inhibit beneficial bacterial growth (allegedly). Silicone II's apparently more weatherproof which could mean better suited for aquariums. The alleged dangers of GE Silicone II has me worried but it could be perfectly safe :)
 
MrMuggles
  • #10
I've heard II's added antibacterial properties inhibit beneficial bacterial growth (allegedly)
i was worried after reading that same internet hearsay, so I read the label obsessively and there's nothing on it that indicates anything special added. If it was being added and is super toxic to life forms, surely it has to be listed. My cycle proceeded in a typical amount of time, regardless. It may just be a higher "grade" of silicone or more advanced manufacturing process.
 

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