Seam sure 2 oz water based seam sealer is a fast drying, water based urethane formula designed for sealing sewn seams on synthetic fabrics and breathable laminates. SEAMSURE dries to a clear, flexible, long lasting film with a nearly invisible non-gloss finish. Ideal for waterproofing tents, packs, rainwear, garments, tarps and more. SEAMSURE flexes with the fabric insuring waterproofing even in cold temperatures and high wind conditions. Its unique brush applicator allows the user to easily apply SEAMSURE into needleholes, sewn joints, corners and under lap-felled and folded seams.