This is the McNett SeamSure 2 oz Water Based Seam Sealer for Tents, Tarps Rainwear etc. Features: Water-based urethane formula is designed for sealing sewn seams on synthetic fabrics and breathable laminates Unique brush applicator lets you easily apply sealant to needle holes, sewn joints and corners, as well as under lap-felled and folded seams Dries to a clear, flexible, long-lasting film with a nearly invisible non-gloss finish Before use, clean surfaces with Seam Grip Pre-Cleaner (sold separately) or isopropyl alcohol This handy sealant comes with a unique applicator to help seal seams on tent floors and rainflys, bivy sacks, rainwear, backpacks and more.