I am fairly new to building heads using epoxy. So far I am averaging about 3 flies for each small batch of epoxy I am mixing up. After three flies the epoxy is starting to set. I am wondering how many heads you epoxy experts can build in 5 minutes and if you have any pointers on techniques or tools used to speed things up. When finishing the heads on a dozen flies do you go to a slower epoxy? Is there a difference besides the setup time between 5 and 20 minute epoxy?