Learned lead work from a old timer that only metal finished or leaded. He was the best body man I ever met. He could straighten anything but never worked on anything newer than the 50's. Bondo is easier but lead is more traditional and should last longer. Last newer car I tried lead on was a 79 Capri. Touched it with a torch and if warped all over. I've used 60/40 70/30 both. Could tell much difference between the two.