DirtBall

Alot of guys jigging for walleyes here in Ohio are using a small stinger hook attached to their jig. It consists of a small trebble attached to about 2 1/2" mono leader with a small loop in the end. The end is coated with some type of material that the jigs hook point is pushed threw. I want to make some of these, but I'm not sure what to use to coat the loop end to push the hook through. Any ideas?