I helped a friend vacuum seal some mason jars with weed one time. All we did was put wax paper over the rim of the jar, then screw on the lid as tight as possible. Then have a pot of boiling water, and play the mason jar inside, not all the way, half way was all we did. And you leave it in there until you hear a pop, and that is the lid being sucked down inside, and that was how we knew when we got a good seal.