I've used head cement for years. In the old days, it helped hold my flies together since I finished each fly with three or four half hitches. BTW, I don't think I ever had a fly come apart with three good half hitches and a good application of George Herter's fly head cement. I now finish my flies with a whip finish and a coat of Fly Tite. I really don't see any reason not to use it. Fish don't seem put off by the alcohol solvent (including brim). Fisherman have never refused an offered flies. I just think the cement helps to protect the thread wraps and keep them in place against prying teeth and hemostats. Just my 2% of a dollar. I'm sure others will disagree. 8T