Tony, I use the same stuff to make eyes. Also, save the lids from coffee cans to make them on.

Squeeze a drop of yellow, red or silver / gray for the iris and a smaller drop of black for the pupil. Then gently tap the lid against the table to flatten out the points that form with the Tulip material. Once the eyes are dry, peel them off and glue them to the fly. I make them a dozen at a time. They work great.

Tight lines, Chris