This is the McNett Sil-Net Silicone Seam Sealer 1.5 oz Tube w/ Brush This Great Seam Sealer Features: Seals in one application Unaffected by extreme heat or cold One tube seals critical seams on an average 2-person tent Specially formulated for sealing seams on tents and other outdoor products constructed or coated with silicone, such as silicone treated nylon.