Some are plastic but most are still glass.Fish tanks aren't always glass they are usually acrylic (I think) not sure but isn't that some form of "plastic"?
http://www.aquarium-pond-answers.com/2007/03/aquarium-silicone.html
This says it does bond by melting so probably not a good choice for plastic. Ok . Going back to bubble gum. What would you have to lose by trying it?
http://voices.yahoo.com/chewing-gum-used-as-glue-sealer-2931200.html
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