Here is a short video about tying a nymph without using thread. It is made only with UV Resin and Lead wire. Even if is considered a strange fly and lots of guys are not confident in using it, this kind of nymph is used with success for aprox 15 years on rivers from French Alps. The nymph is more efficient if is tied very small, down to #22 ( on straight hooks ). It is called ceramic nymph and the original tying process is very complicated ( it is used special dye for ceramic to color a fly and you need at least a few hours to finish it )
Here is my short version on this fly, it imitates a ryachophila larva and I had success with tied on size #16 and #18.