A bit late but years ago I bought a roll of vapor barrier from the local lumber yard and have been protecting my plans with it ever since. CA and epoxy pull off easily. If the plastic gets too messy or accidentally cut just cut off a replacement piece and toss out the used one. I have built atleast one large scale A/C a year plus many repairs and am still on the original roll. Make sure you get a roll of the heaviest guage you can find as it does come in several weights and the lighter ones won't work as well.