As far as I know all car manufacturers used lead in new car production back when.
There was a time in the past when lead was used by body shops to make repairs. Body fillers like Bondo had either not been invented or whatever was available was of poor quality.

If you are just skimming over the existing lead seams absolutely.  Everglass is what I'd recommend if the entire seam needed to be filled, like after a full quarter panel replacement.  That's just due to the potential for flex and the depth of filler required. 

Thanks Tommy. The whole film was interesting.  I worked at Tilden Mine for just 2 weeks short of my 2 year anniversary.  As I recall, my final layoff technically would have been the 5th lay-off after the 25th anniversary of Tilden in operation.  Just prior, all of the hype...propaganda 😜...about operating another 25 years...they just didn’t say consecutive 25 years.😂😂😂.  With a family, I moved on and they called me to see if I was interested in returning.  I kindly declined.  I had some great supervisors and enjoyed the work...just not the lay-off and being unemployed.

BTW, when they were combining Empire Mine and Tilden Mine workforce, the junior electrician had 29.5 years.