I would go with this Japanese URUSHI Lacquer YOROI KABUTO SAYA Repair Clear - eBay (item 370316926886 end time Jan-13-10 16:16:01 PST)
As I said earlier, there is a particular method for using urushi. I bought some ( from http://www.hyper-cafe.com/html/Category-12-0.html) and read up on how to apply it, but I haven't tried using yet.