Seam Sure Water Based Seam Sealer is a fast drying, water based urethane formula designed for sealing sewn seams on synthetic fabrics and breathable laminates. Seam Sure 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. A unique brush applicator allows the user to easily apply Seam Sure into needle holes, sewn joints, corners and under lap-felled and folded seams.