Sealing silencer box's engineered wood

Hello folks, I'm building two silencer boxes for my studio. It was suggested to me to seal the wood of the boxes in order to avoid them to off-gas any of the chemicals they are made with. We are talking about MDF here. What would you use to seal the wood? Would paint be enough? Should I seal them inside and out? Cheers!

It was suggested to me to seal the wood of the boxes in order to avoid them to off-gas any of the chemicals they are made with. We are talking about MDF here.

Do you have any furniture in your house? Unless it is definitely sold wood (and therefore expensive), then chances are it is made with MDF. What did you use to seal that? :) Also, the interior surfaces of your silencer boxes will be completely covered, all over, with thick duct liner, so the wood will not be exposed to the airflow at all. - Stuart -

Hey Stuart, those were actually my thoughts, but in another topic you told me that "plywood, OSB or MDF would be fine too, as long as the inner surface is sealed in some way. You don't want the wood to absorb moisture from the air, nor do you want engineered woods to off-gas any of the chemicals they are made with, into your air-stream. " That scared me a little as I thought it needed to be more than just duct liner, but now that you are confirming it is enough you've just given me the very last piece of information I needs to complete the studio. Thank you so much!