Stanley S 420 Aquarium Silicone Sealant Clear - 2x10.1 Fl. Oz. Fish Tank Safe, Waterproof Bond to Glass, High Elasticity, Non-Toxic Aquarium Sealer for Freshwater & Saltwater | 2 Pack

Stuff works and adheres to glass great!

Used this to reseal a used 55 gallon aquarium that I was refurbing. Wasn't quite enough for the whole tank (had to use a second tube), but it has held tight without leaks for several weeks, so I can't complain.

This quality glue is easy to use and provides a strong, waterproof bond. I have a 7 foot vertical square aquarium that is very attractive but difficult to maintain. It has deteriorated over time and leaked around the base. I removed the base and resealed it with this Stanley product. It did great job sealing the leakage even with the pressure of the tall tank. This is an excellent product.Damon M. Tatem

When it comes to sealing aquariums the general rule is that plain 100% silicone caulks should be fine and aquarium safe, but for those the want a piece of mind and desire a caulk that is actually rated for aquarium use this Stanley caulk is a great choice... It's reasonably priced, and so far is working as expected... I used it to reseal a 55 gallon, I was going to fully disassemble the 55 and build it new, but decided to just reseal it vs risk breaking the trim rings... So far so good, the silicone spread out well and bonded well to the cleaned glass, no issues and the tank is no longer leaking...

I needed clear silicone for my hummingbird feeders that were cracked. Instead of throwing them away, I used a little silicone to seal the cracks. Works very well and this tube will last me a long time.

Stanley is a known and trusted brand, so you bet this was my first choice for aquarium repair. If you're into buying old aquariums then you may need this stuff to ensure your seals are adequate. I've even used it to reseal some store bought ones too. It is super strong and heavy-duty, so once it's sealed it's SEALED. All in all a great brand, and quality silicone sealant.

I recaulked my tank 3 times and had to empty it 4 times. It does not seal, fill in or make a leak proof seal. Now i will trash this tank because i am not going through it again. Will not buy this brand again.

I had an old reptile tank with bad seals everywhere and used this sealant to refurb the tank. The refurb tank has now been used as an aquarium for two months with zero issues. Sealant flowed well and was easy to use.No Complaints - Highly Recommended.