Hello Largetrout,
I don't really use epoxy buzzers as I prefer mine to sink quite slowly & hardly ever fish anywhere where the need for them to drop too quickly is required, but I did tie some a few years back just to say I'd tried it.
I found (using the two pack epoxy) that I had to tie say a dozen buzzers at a time, mix up the epoxy, apply it (I just used a dubbing needle to smear it on) and then find some form of holding each fly while being able to rotate it as it dried.
The ideal method would be to use a rotary fly drier (the circle of foam connected to the shaft of a tiny electric motor) which allows the epoxy to dry uniformly around the outside of the buzzer. I however had mine sitting on dubbing needles and was doing my best to 'keep the plates spinning on the sticks' - not very professional.
I found that however 'rubbishy' you apply the epoxy it will even itself out during the rotating/drying period.
Hope this is of some value.
Iain
