I think a lot of this has to do with the material involved and how it's been stored. One key giveaway, does the material smell like plastic or some other chemicial?
Obviously, if you have a choice in the matter it's far better to cure it. For example, those plastic trash cans we all use may have been stored next to the pesticides.
On the other hand, if you have an emergency or critical repair, you'll have to go with silicone, PVC, flexible hose, acrylic or glass.
Also I'd be carefull about using bleach as part of the curing process on anything that's going to be used inside the tank.
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