I tied my rirst fly about 44 years ago and the best fly dope, i mean head cement, I ever used is Sally Hansen's, hard as nails nail polish. It's the only one I've used in at least 15 years. I thin it, if/when nessessary with acetone. I take one of my insulin syringes and put a few drops into the S.H. and mix to the consistancy I want. I keep thin, very thin and original depending on what I need at the moment.