Well, i've given up trying to seal it with aquarium sealer. I bought a couple lids last night im gonna mess with them today and see what i can make happen. The problem is the top is slightly out of round, so the screw on portion doesn't make contact all the way which causes it to leak slightly. I want to use it as a fermenter and have it be air tight. I currently have a batch going in one, but its leaking co2. Im sure the beer will turn out, but i was expecting a tight seal.