Thru experience the lead on a car is really a 50/50 solder sold in bars at a Plumbing or electrical supply, lead it self will not stick to steel, a little sodlering flux ( NOCORODE brand ) and a cloth made out of JEANS material with a little wax on the cloth .. you will soon be called George Barris ..LOL
Non lead filler I think will very hard to work with with a torch. It means it has less lead and I higher melting point ... the lead is flexible and dosent crack.
As long as you dont eat it ... its the best for long lasting body work ... LOL
Ron
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