I've used the gorilla glue for fish stands and non-fish projects, here's a good one: http://www.gorillaglue.com/glues/gorillaglue/index.aspx It takes about an hour to dry. But I would not be 100% confident using it underwater around living things. It is supposed to be non-toxic after 24 hours, so I'd wait at least that long and rinse well before using. For some real small job, I'd consider using it, like fixing a filter or something.mr.davon24 said:have you used the gorilla glue? How long does it take to cure?