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Parafilm is permeable to gases, and generally you don’t want to enable oxidization with most foods. A modified, coated version of it would be a great consumer alternative however.

Without this it is nearly DOA for this use case. I almost always use plastic wrap for the specific reason of preventing gas transfer

I totally forgot about that. I interned in a couple chemistry labs in college.

Now that I think about it, a product like Glad Press 'N Seal isn't quite Parafilm but it's a big improvement over the conventional cling wrap for a lot of purposes. Not sure how Parafilm costs compare--although prices probably aren't a great proxy given probable margin differences.

i'm not sure i would want to eat something that had been wrapped in parafilm - ex microbiology lab tech speaking.