ORIGINAL: vicman
I use the thickest dropcloth plastic Lowe's sells and the cheapest white caulk to seal it off. When I skin the balsa to foam I use the same plastic between the balsa and foam shuck to keep any glue from pulling thru the wood and sticking the whole thing togeather.
When I do glass over the wing exterior I get some .005 thick clear plastic from an art store and use that for the finish barrier. I put some paper towel around the exterior to allow even pressure and give a weep area for the glue to go.
Works pretty good for me and is much cheaper than peel ply and custom bag material.
Im going to try some vacuum bagging in the near future. Are you saying the paper towel goes between the bag and wing surfaces. If so how do you get the paper towel off the wing when dry. I know peal ply is made to peel away from the glassed wing. Do you sand the paper towel away?