Like the others said' if you're gonna melt that type of lead BE-CAREFUL. There is a lot of cheap fillers in tire weights. I have found that you have too let it get to the max temp. It will look purple golden on top. Then take a laddle and skim the impurities off of the top. Be carefull if you add more lead as you're pouring your molds, this is when the gasses are released or the splattering occures. A lot of places that produce tire weights re-use the old ones. I was told that they use detergents/chemicals on the bulk metal and that it sometimes gets caught inside the weights. Use gloves and a mask and have plenty of ventilation. Do it outside to be safer. GOOD FISHING.