the new plastic fillers are a wonderful thing in thier place, but they do not do well on the edge of things, hoods, door or door jambs, or on anything that is sharp edged, if hit in those places the tend to chip off leaving an unsightly hole, lead used in those places will not chip if hit, it may dent or leave a pit that is east to fix but it wont chip, well maybe the paint, there is a place for every thing, lead causes no more problems than plastic fillers if propery cleaned, lead gets a lot of bad press because most builders dont know how to use it, jmo