GE 1 has to say not for aquariums because mainly and agreement between the 2. These are geared for home projects. I agree with James, I have used it to reseal tanks before and works just fine. Its meant for car parts and electronics etc. This sealant is especially made for a broad array of purposes that may be exposed to inclement weather conditions primarily the areas outside of your home. GE silicone 1 and aquarium silicone is basically the same thing except packaged different and a higher price for aquarium silicone. Mold/Mildew is ugly so having the resistance is important. 1 X Bond It Black Ha6 Silicone Sealant High Modulas Safe for Rtv Fresh Or Marine Salt Water Aquarium Fish Tanks - Eu3 Cartridge (Approx. There is always concerns for this chemical when it deals with aquariums. I put an image of the exact one I bought So at least the G.E. The bright green label is easy to spot, with the SCS1200 model number clearly visible. Another transparent silicone, the GE 1200 series construction silicone comes in a standard 300ml tube fit for a caulking gun. I wait a month to make sure it is safe… Like I said in the first reply to this thread, GE Silicone II is the only one that has been proven to be safe after the waiting period. 310Ml) 4.4 out of 5 stars 61 £5.60 £ 5 . GE Silicone II 2 GE 1200 Series Construction Silicone. GE silicone 1 aquarium safe can deliver instant cure. G.E. Silicone I or aquarium silicone seem to be the only two that are safe to use in a quick search. If you check the label most "100% silicone" have formaldehyde in it. Again, the FDA considers normal use of undamaged silicone cookware and other items to be safe. I have to go exchange it tomorrow. GE Silicone I and II, long used by fish- and frog-keepers and generally thought of to be aquarium safe, is probably no longer so. GE Silicone II is good to go, but you will find others. I saw videos online saying it was okay for that but now I saw this. These areas include windows, doors, siding, trim, molding, baseboards, vents, basements, attics and around wires and pipes. It doesnt matter which 100% silicone you get from the hardware store, GE I, GE II, Bills fantastic silicone, White or clear. As a construction grade silicone, you’ll find this product to be tough enough for any tank. brand is easy to find and safe to use. I did notice aquarium silicone at home hardware but it was black and I wanted clear. Most silicone products found in hardware stores have a Mold inhibitor (called Bio-Seal in the past for GE Silicone II) mixed in with the silicone. Now if you get the non caustic stuff, thats the bad stuff. It cures by releasing alcohol instead of the vinegar smell. Just like the above, once its cured its food safe. From the #1 Silicone Brand, All Purpose Silicone 1™ sealant is a 100% silicone and 100% weatherproof sealant ideal for areas that could be exposed to weather. Aquarium safe silicone is the only 100% safe silicone. No caulking tonight. GE began using mildew inhibitors (Bioseal) recently in most their silicone products, even if the label says "100% silicone" and doesn't mention anything about mildew. The FDA also considers use of silicone breast implants to be safe. You can use GE Silicon II as well, but that needs a lot more curing time, especially if you plan to have heat in the enclosure. 60 £6.99 £6.99 Just check the MSDS for acidic compounds and for more advanced sealants conductive compounds which is required for some to make perfect grounds on aircraft aluminum, yes that is a bit above and beyond but since I have used sealants specific to grounding I figured I would mention it. i bought GE silicone 1 all purpose silicone to use for my DIY refrugium but on the back it says “not for aquarium/underwater use. Silicone leaks off ammonia gas for around a few weeks, depending on the brand, and has a chance of never being safe for herps. This is the only answer I can agree with. Should I use it or no? This is highly recommended for exterior sealing projects and if you wish to have it done in a weather-resistant approach. Has to say not for aquariums because mainly and agreement between the 2 find product... 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