Ever had parts snap and break many times (for eg. Chassis parts of 4-wheel drives)? Well, it's irritating to have to spend time gluing the piece back isn't it? (And have it come off later!)
What can be done is to actually wrap the broken part and the part where it is supposed to be joined to in tissue paper and apply superglue over the wrapped part. When dried, these 2 "ingredients" form a really strong bond that seals the broken pieces under normal conditions.
It's really tough, try breaking the part off, there's a "crack" sound!