Next we apply Peel & Stick Ice & Drinking water Defend to all the penetrations (Chimney, Skylight, Plumbing Stacks, B-Vents, Air Vents, and so on.) and all the partitions. Polyester resins and chopped strand mat will eventually delaminate. be warned. http://oxorooms.com/index.php?page=user&action=pub_profile&id=67055