Another "Remove the old glue? What???" guy. Granted, I haven't ridden sew-ups for 20 years, but I did my share. Always considered the first glue job suspect. Never felt confident until I pulled a tire and the glue stayed firmly bonded to the rim. Then it was one coat, tire on and ride around the block at about 100 psi very gently. Good to go the next day. And on-road changes? Did them dry, rode the first 5-10 miles carefully and the tires were always decently bonded when I got home. I don't recall ever putting glue on the tire itself. Raced criteriums, Vermont road races and did all the rest of my riding on that setup for 20 years. Had adhesion problems twice. Once with the old tape before I started gluing and melted the glue riding down Mt Washington. Learned about the glue when I burned my hand when I blew my front tire and puled the wheel.

Ben