don't use silicone as the bond won't be strong enuf to be safe. that is a lot of weight and silicone bond strength isn't as high on acrylic. there are some epoxys that would work good for this but the best bet would be to make your external overflow out of glass.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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