Two years ago I was at a fly show and I observed a professional tier tying a dry. Upon finishing the fly she said that she rarely uses head cement. I decided to try an experiment last year and not use head cement on my dries. It did not seem to make a difference. My flies seemed to last just as long with the head cement as without. I must admit that I rarely end up fishing one fly all day and I lose many of them before they can show their "wear a tear" but the flies that I had to replace were not due to the thread becoming unraveled during use. Is head cement overrated?