Over the past couple of days I've managed to melt the biggest part of a new 50 pound batch of wheelweights that I got on Tuesday. Bad weather has run me indoors both times before I could finish.
That is the thing about wheelweights, they are not ready to go right into the casting mix as-is. First you have to melt them to remove the clips.
This is not something you want to do with your good casting pot or electric melter, either, as used wheelweights are generally filthy. This batch was swept up off the floor of an old tire shop, and some of them had been there for a LONG time!
I melt the wheelweights outdoors in an old cast-iron pot on top of a Coleman 'Sportster II' (not a stove, just a tank with a burner on top) and pour them into small loaf-pans. This produces ingots that range from 3-5 pounds. The clips will float and can be skimmed off with the dross (and there will be a LOT of that!).
The lead is finally clean and ready to use for casting.
In addition to the labor involved, there is also a significant waste factor. From six ingots totalling 24½ pounds, I have accumulated 5 pounds of clips and dross. I will probably only get another 15 pounds or so of clean lead because the weights get smaller the farther down I get in the container.
Still, about 40 pounds of lead for five bucks and a little Coleman fuel ain't bad.
The point of this long-winded post?
Wheelweight lead is like heads-on shrimp. You have to make sure that you get it cheap enough to justify the work (and waste) involved.