Just my 2p worth, not that it's worth that much at this time of night.
The first thing to ask yourself, and others what is it made of ? Then find the right glue / solvent to weld it, ie. It melts it just enough and join back together and then slowly solvent evaporates, so it becomes one,
Some plasic's are harder than others, methyl chloride welds Perspex, and a few other things but it don't touch plasic milk bottles. Which are LDPE,
Some things like heat, I think that's how they join those big gas pipes these days.
But what I will say is you only really get one go with fixing it properly, and It needs to be clean, and I mean clean and dry.
If all else fails and you can' t find anything then yeh, epoxy type thing and if it flexes/bulges umder pressure , you will be in the same boat at some point.
So start saving,
Good luck
Edit.
After typing this, I just thought, I'd ask my mate. ( Google) I got this link.
http://www.brewplus.com/forum/threads/u ... yone.2114/
So if it's the same. It's a now a flower pot.