Gear Aid Seam Grip +WP Waterproof Sealant & Adhesive (28g)

This magical stuff permanently seals seams, patches holes, glues stuff together and offers abrasion resistance.  It dries waterproof and flexible and is able to withstand extreme temperatures.  You can use it on all types of surfaces and fabrics including neoprene, PVC, rubber, leather, vinyl, nylon, etc. This 28g tube can seal up to 12 feet of gear.