Lead body work
I used that kit. Glad I did it, but it is work compared to plastic, but I felt it was
A- much stronger
B- really the right way to do it
BUT
I was working with a rotisserie, so it was easier to keep the hot expensive Liquid Metal from ending up on the floor.
Knowing how to solder wires, I felt working with it at butter consistency was the equivalent of a cold solder joint.
EDIT: I don’t recall if I used a lead free kit, or if it was leaded.