They tried to teach us to lead fenders in HS Body shop
( backabout the time your Road Runner was in the showroom )
What an art to get it right!
Just enough heat needed to flow the lead, and then get it to stick..
2 degs too much and it all falls out in a puddle
20 degs too much and the panel warps
5 degs too little and it doesn't stick...
what a PITA

Thank God for the good fillers of today

Don't forget Pliogrip seam sealers made by my Co
Ashland Specialty

"wanna hear God laugh? Tell Him you have complete control now!"