A few follow-up's in my response...
Evan - To combat drips, I hang the barrel/insert to dry and after 15-20 minutes I take a dry paper towel and just touch the drip at the bottom of the call. I don't press it up to the call itself... just touch the drip. The dry paper towel will suck the drip away from the call. I believe there is a pretty good photo tutorial on THO that was posted by Brian Byers. This is where I learned how to dip calls.
Lagrue - For spraying with a rattle can, how have you found to keep from getting "orange peel" effect? This is what I battle most when using a rattle can.
Vince - I've often thought about using an old rotisserie motor to set up a slow rolling device to prevent drips. But, I never could come up with a design that would do what I needed. Do you have a rolling system you've used? Also, when you wipe a dipped call, do you find it leaves high/low streaks that have to be sanded down?
I've been rethinking finishes for the past few weeks. Have been re-reading posts on this forum, doing google searches, etc. So, this conversation is good timing for me. I'm always wanting to find the finish that will stand the test of time and look good doing it.