Rtv 100

[stinkyreef]

Am I reading this right? Did I buy the wrong product?
Says do not use underwater

 

[uncleof6]

You are reading it right. Silicone should not be used underwater. That said, the RTV100 series silicone is the most often used by pro builders of aquariums. The reason it can be "gotten away with" is because the silicone that actually holds the tank together, does not come in contact with the water. The inner seal prevents the contact, and insures the longevity of the structural seams. Anyway, that is the right stuff...

 

[NanoReefWanabe]

should have this stickied for all those whom seem to firmly believe silicone is meant for below grade use.