Hey guys! I just read through this thread, man what a lot of great info!
I've been pouring lead (bullets, sinkers and jigs) for many years. I've been very pleased with a couple of products from Frankford Arsenal. Drop-out mold release and CleanCast fluxing compound.
The Drop Out is invaluable as a mold release. Just spray it on and, most of the time, jigs will fall right out of the mold. An application will last for quite a while.
The CleanCast is hands-down the best fluxing agent I've ever used. In my experience, it works better than paraffin, beeswax or anything else I've used..
It's available from Midway USA. http://www.midwayusa.com/find?&newcategorydimensionid=5671
Tom