I just did some research that explained lead has to reach a temp of around 1800 degrees f before it will give off hazardous fumes. It also explained that around 800-900 degrees, it will still give off a very slight amount of toxic fumes, not much to worry about, but exposure to these low temp fumes over a long period of time can lead to an accumulative build-up in the body. But with proper ventilation, it's very difficult for any lead build-up to occur.
I don't see how clothing can be a transfer hazard, unless you lick your clothes after every casting session :wink: . It's not like nuclear contamination. Any small (make that very small) amount of lead that settles on your clothing can be easily washed away, and it won't contaminate your washer or dryer. Think of leaving a lead sinker in your pants, then washing it. You just end up with a clean sinker and your washer/dryer is fine.
As far as casting in your garage, I suggest you add a small fan to move any fumes out the door. In the article I read, it explained that if the air movement is enough to move smoke from a lighted match, it is enough to safely melt lead. Bill