Alright, so.. I’ll say it once more and then leave it alone. You will not be able to powder paint those jigs with a torch, lighter, heat gun, or burner. After a couple seconds you’ll have a hook on a pair of hemostats and a tungsten blank on the table. Been there, done that.
To effectively paint those TUNGSTEN jigs, you will need to use an air brush, hard as nails, or vinyl. If you want a “professional” look, airbrush is going to be the only way. If you just want them painted some solid colors then you can go to the dollar store and get some nail polish.