I've used that method and it's fine after fully curing if you use the correct type of silicone. Ingesting isn't something that should happen, as it should be fully secured if you do it right. After it's dried, you have to clean out any loose debris and toss it.
Bogertophis is right about not being able to easily clean it. I wouldn't do this method unless you are going bioactive + are properly quarantining animals away from the enclosure with this.
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