Lum ... I have a Hilts jig mold that molds 1/16 & 1/32oz "insert" style jigheads. I don't make many, anymore, since I started using "weedless" style jigheads. When I was making them, I used an old lead pipe sheath, lead door weight, wheel weights, and other items that contained lead. I found that running the first 4 or 5 sets of jigheads thru the mold, then melting the lead off the hooks and back into the pot was necessary to "heat" the mold to a sufficient temp to allow the following runs to fill the jighead cavity completely - thus making a full cavity pour, and resulting in a usable and reliable head. I skim the "slag" off the lead in the pot, before attempting to pour, thus removing some of the other materials present. Since these were "insert" style heads, I had no reason to paint them. I rarely use painted jigheads, even now. I have Teezur and other brands of painted jigheads in my boxes, but generally tend to use the "weedless", unpainted versions more often than not. My use of "non-weedless" jigheads is primarily for open water situations, which is only about 5% of the time I fish and on certain lakes or under certain conditions which cause the fish to relate to open water or suspend above the cover.
Two of the most important "other" items I have, in my jig molding arsenal, are heavy oven gloves and a filter mask. I have no access to an outside area or out-building, so I have to limit my use of the mold to when I can open a window and turn on a fan to draw the fumes away from me and the inside of my apt. Take care in your hobby .... cheap jigheads aren't worth risking ones health. And make sure that the "powder paints" usage (baking)isn't also a health risk. I would hate to lose anyone, from our Crappie fishing family, over this. Though I understand the desire to "make" something, whether for economical or "personal pride" reasons, I don't wish any harm to come to those who would. Be safe and ........luck2ya .........cp