Nice cage! That cage with a radiant heat panel will work out wonderfully and be so much easier to maintain than messing with undercage heat. Good job. That is what I wanted to say.

The rest below is my guess, not fact:

I don't know about the silicon, other than the aquarium sealant doesn't have the additive that kills mold and such. That is why it is deemed safe. I would honestly think that any silicon sealant will be OK, since the boa won't be immersed in it or eating off of it. Heck the chemicals in unsealed plywood may be worse. Substrate will take care of that.
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Mark

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