Silicon?

[Magma]

sounds like the bottle I have, I wont be using the tank for a few months anyways so I will re seal it then leave it before I even test with water.

[Lampshade]

I found GE silicon 1 at HD the other day, it's hidden on the bottom shelf at the store out here. Not sure if your store's the same layout, but they where hiding in plain sight. I swear they are part ninja or something though... i had to ask where to find it.