Check the listing for details. Gear Aid Seam Grip FC Fast Cure Seam Sealant 2oz Waterproof Tents Tarps (2-Pack). Color: Multicolor, Condition: New. Listed at 18.16 USD. Seam Grip FC is a fast-curing, water-based tent seam sealer. One bottle of this waterproof sealant seals 60' of seams - making it perfect for family-sized tents, tarps and pop-ups made of nylon and canvas. Just apply a thin film to the inside seams and allow to dry. Don't let rain make you miserable on your next outdoor adventure. Seal and waterproof tent seams with Seam Sure FC and stop leaks before they happen.Seam Grip FC is a fast-curing, water-based tent seam sealer. One bottle of this waterproof sealant seals 60' of seams - making it perfect for family-sized tents, tarps and pop-ups made of nylon and canvas. Just apply a thin film to the inside seams and allow to dry. Don't let rain make you miserable on your next outdoor adventure. Seal and waterproof tent seams with Seam Sure FC and stop leaks before they happen.