bonding false rocks to tanks?

I read a verrrrrrrrrry long thread on making false rocks and such, BUT it does not state how to bond it to the tank.. I dont want to use something toxic.. Does anyone know what I could use? thank you in advance:gj:

Cheers

If you're using something lightweight, aquarium sealant does the trick quite nicely.

thank you, I will be puttin styrofoam fake rock in. thank you for the advice!

Cheers!

clear ge silicone I window and door
you want the stuff without bioseal or fungiside!
also if you read the bottle it says not for aquarium use.(legal purposes)
the upc number is 0 77027 00012 2
let it fully cure

if you want something permenant try aquamend (home depot is the only one to carry it so far)