Do PVC terrariums need silicone?

[The Serpent Merchant]

I figured i'd seal it for better humidity and make it semi water resistant.

That's why I'm asking. Not sure if they should be sealed or not.

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It does, at least the joints where the bottom and the sides meet. Otherwise urine or a spilled water dish will make a big mess. I would advise you use a black or clear aquarium grade sealant.