Every diver needs a tub of Polyglut.  It is a top quality neoprene glue suitable for all wetsuit repairs but the added butanol makes it suitable for seam sealing as well.
Simply use a brush to apply a coat of Polyglut over the exterior seams and add years of life to your suit.  The rubberized coating adds abrasion resistance and prevents cut threads from running.
Suitable to make rubberized knee and elbow pads.