Doug I also came across a type of filler like you indicated "metallic filler " but in stripping it I senced a SILICONE consistancy ... and your 100% correct the lead was for strenght and FLEXIBILTY ..used in automotive at the JOINING points of panels. This was so that the car could flex at these points ... it takes a lot of practice to work with lead hence the word "PLUMBER". worker of lead. By the way WESTCHESTER LICENSE still requires a practical test working with lead.
R
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