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Sounds very nice. I did multiple 8' x 12' foam sandwich panels and just used 6 mil builders plastic. Worked fine and quite inexpensive. 95% of my leaks were at perimeter pleats by the way.
Does odd shaped mean it has sticky up bits? If so, you need to add pleats to allow the bag to properly press on the laminate, otherwise the bag will "bridge" and push down everywhere.
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