body filler application

If you are talking about regular filler, I agree. When I dig all the lead out of a seam, I smooth it out with a product called Metal 2 Metal by Evercoat. It is a metal-based filler that is VERY strong, cures VERY hard, is waterproof and will not crack. You can also use a fiberglass reinforced filler, but I like the Metal 2 Metal stuff.
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Nice, I have a bud that uses "Allmetal"... he's been doing it for Moons, but I do know last time I spoke with him about that, was 16 years ago. And I'm not sure if he uses that for Lead replacement. I do KNOW, Alan is one of the Best. 2 in charge at Caddy, builds some Sinister Mopars, and has painted my Harley many times (racing is hard on stuff, lol)