ok thanks everyone. I am definitely going to wear a good mask and do it outside. I'll post some pics when I have the body stripped.
the lead is gray in color and much harder than bondo. I would guess its at least 30+ years old? the truck has several layers of paint and 2 paint jobs ago they covered the entire fender with a coat of bondo. way too much bondo! anyway I was removing that with a scraper and chemical stripper then the last bit with a 4 1/2 grinder with sanding grit discs (probably same thing as roloc). That is when I hit the lead on the lower front fender. I felt some of the dust with my finger and it looked kind of like graphite or pencil lead. then I noticed the edge of the fender looks they just let it drip off.
