10mmplastic grow room myth or legend?

so this is my 2nd grow i want 2 make a room inside a room out of 10mm plastic but will this work? will the smell leak thru the plastic? would duct or gorrilla tape mak seems air tight? i would use a carbon scrubber to remove the smell of the air traveling out!.,,,,any 1 with opinions or experience welcome! thanks n advance

any idea? did research cant find anything...fellow greenblunts advice sought!