I'm doing up a fancy multi-tiered punch bowl with a small aquarium
pump inside. I'd like to string the power cord in through a hole at
the bottom. My question is what sealant can I use that is non-toxic
(given that it will be in direct contact with the punch?). The wire
will be held in place by a plastic fitting, so the sealant need not be
strong, just prevent leaks.

Thanks

John