i didn't see where it said it wasn't waterproof. i'm not even sure it's a legit company anymore. all the info about it on other forums is pretty old, and it seems the guy wasn't good at keeping up his business. i was hoping sommeone here had more recent info. i just finished re-doing my crab tank and used styrofoam covered with sanded grout. i sealed it with dry-lok natural. then siliconed the edges where the mortar met the glass.





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