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If the pipe is sealed tight 100% you will only have the moisture content of the original air in the tube. If you seal it on a cold as snot dry day when the snow squeaks, you will have the least moisture for VT. Cover everything in cosmoline, they sell it in spray-on cans or cans for a brush. Mylar bags: http://www.amazon.com/gp/product/B001Y0Y8C6/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B001Y0Y8C6&linkCode=as2&tag=thegrenorpre-20