Welcome to the forum.If you are getting into bait making to save money then do the math first. Pot around $50. Molds 25-45 each. Skirts for the jigs 25 to 50 cents per tab so 50 cents to $1 per jig. Good hooks 50 cents each. Lead $2-5 per pound. Gloves, goggles, paint, etc etc.All that said I have been doing it for over 30 years. I make all of my own jigs and plastics (except for Zero worms which aren't poured). I have never saved any money but have a great time.To answer your question about the lead. You fill your pot about 1/2 to 2/3 full, pour your jigs and unplug the pot. Leave the lead in to slow down rust.Please feel free to post other questions here if you want to. I'll be glad to give you help in locating supplies if you head into this venture.
The weed guard is the last step in making a jig.
Super glue gel is the way to hold the wg in place.
It takes a lot of time sometimes to retrieve a snagged jig and sometimes you end up snapping it off anyway. Nothing worse than hanging up on your first cast to a great looking tree and wrecking it retrieving a $4 dollar bait. Nothing to snap off a 50 cent jig and tie a new one on.