[Greenbuilding] OT: repairing cracks in plastic tubs

[Reuben Deumling]

This is only sort of related to Green Building. But in so far as repair
tricks advance the general purposes to which GB is devoted perhaps this
question is admissable.
How to seal small cracks (1-2" long) in a plastic tub? Any caulk in
particular advised? Duct tape? This is heavy gauge but still somewhat
flexible plastic meant to hold liquids. Unfortunately I couldn't find any
symbols identifying the type of plastic.

Thanks.

Reuben Deumling