Black Aquarium Silicone Sealant - 10.2 Fluid oz Cartridge

Wow, this stuff sticks to glass, it must be a really high grade. I know ASI doesn’t have a silicone factory, this stuff all comes from sources upstream so they are using some really high grade stuff. It flows good and the edges are firmly planted.

Works great. Smell is strong when applying

I used this when reconditioning my 2006 50 gal aquarium, which has now been setup for a year after application. I used the clear, it's none yellowing and it's still mostly clear. It's actually mostly opaque in the thicker areas and clear in the thinner feathered out areas. It's easy to apply, well maybe not as easy inside of an aquarium, you need to move quickly and not touch the same areas twice. You may also need some paint thinner or similar solvent based thinner to clean up any mess. It's best to just let it dry, and use a new razor blade to scrape any excess off. Just make sure everything is prepped and very clean prior to application. One tube was plenty for the tank, I used 1" blue tape helping with straight lines. It's not necessary, but it does help make things look better. Cures overnight, but I gave it a few days prior to my leak test. They also have black, but I like the clear better on this tank.I'm sure it would be a great silicone for other applications, so use it up before any remaining in an unopened tube cures inside the tube. It's good stuff and well worth the money and your labor!Cheers!

I used this to water seal some spray foam I put in my geckos 🦎 tank. The product dried pretty quickly for the application I used it for. I cut and sanded the spray foam so The absorbent product I put it on might have been why it dried so quickly. I also didn’t want the glossy look that you get with product so I tried to dust it with some dry soil, but half was already dry & to had to put another layer to get it tacky enough for the dirt to stick on there. This is not the main use for the product, but it works and my DYI project turned out great! And I have a happy gecko, a humid tank and no soggy decor, so I’m satisfied with this product and will use it again if I ever need to!

I used this stuff to make a nano saltwater tank out of scrap glass and it has held up great. Application was a breeze with a caulk gun -- it was sufficiently thick and smooth, thus easy to work with. As it is curing for the first 24 hours, it will release an acetic acid smell, making the room smell like vinegar -- as I understand, this is super normal for aquarium sealants, so I'm not removing any points for that... but you may want to do this in an area with some more ventilation.I gave my tank a few days to cure, leak tested it for a week, and it has been super solid. I feel pretty confident in this product and my application, and I anticipate no leaks or accidents. I've got a custom dwarf seahorse tank with sleek black borders for super cheap!

Only giving this product 4 stars because of the terrible smell. I've used clear silicone before, and it did not have such a strong smell as this product. I opted for black as I was using it to build a dart frog terrarium, and if any if the soil washed away, I would prefer to only see some black spots in the background. It took literally 4-5 days for the smell to disapate. Do not apply this product in an area where people or pets are forced to breath near, until it has cured. I built my terrarium down in my cellar, with the back door open, and fans on, and I still had a headache for days due to the smell. The smell even seeped upstairs!That being said, the product worked well! I siliconed heavy peices of driftwood, and also rocks to my tank, and nothing has budged since! After foaming in my background, and letting it dry, I then spread silicone all over the background, and dumped cocoa fiber on top. After allowing it to dry for a few days, I then removed any excess, and vacuumed it out. The cocoa fiber has stayed put, and now plants and mosses are growing all over the background! Looks great!So as long as you are aware of the extremely strong, terrible smell, I would recommend this product. Once cured, there is no remaining smell!

I had to redo the silicone in my hexagon fish tank. I’ve had this tank for like 15+ years and it sat in storage for a bit. I had to strip the only clear silicone, because it was peeling and looked bad. I think it came out great. My tank has been up for about 2 months now and it’s still holding strong! I’d buy it again if I ever need more. I also think the black looks a lot nicer than the yucky stained clear silicone.

Worked great - I built a custom aquarium equipment baffle/in tank sump with this stuff. It went on smoothly, dried quickly, and adhesion was awesome. Silicone doesn't properly bind to dry silicone, but this stuff still bonded will enough over the tank beads to seal it, though there's very little strain on those bonds, and it's reinforced all around by good quality bonds between glass and plastic.Important notes on how silicone cures ("drys") -1) beads thicker than 1/8" will effectively NEVER cure, so less is more when you need strong bonds, like in aquariums.2) because curing is not drying, low humidity is not helpful, in fact, it's horribly counterproductive to curing. A cure that will take many days at 15% relative humidity will take a couple days at 30-35% and a day at 50-60%. A humidifier in the room if it's dry where you live will dramatically improve the cure time.3) heat isn't nearly so important as humidity, so don't waste your time going at it with a hair dryer or heat gun, the top skin will form faster, but that's mostly because of the air flow. A gentile fan would be much better. It usually won't cure as fast under really cold conditions, but just aim for room temperature.