I want to make a cage setup in a bookshelf or hutch, similar to the pics. I'm assuming I need to seal the wood to keep urine from being absorbed. How long will I need to air out the sealant before adding hedgies? Or, is there a better way to do this?

I want to make a cage setup in a bookshelf or hutch, similar to the pics. I'm assuming I need to seal the wood to keep urine from being absorbed. How long will I need to air out the sealant before adding hedgies? Or, is there a better way to do this?