Tired of Body Filler Hardening Too Quickly?

Kern Dog said

I'm a little concerned about the need to "sculpt" the filler.
Shouldn't a body man get the metal to the point where your filler isn't a 1/2" thick?

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How many guys use a hammer and dolly to work the metal, then anneal it, during if needed, or afterwards? I never learned how to do leadwork from my dad. He kept me away from lead and painting, everything else was ok.