"....for filler bonding.
With the lead clean and bright,
fill corroded areas immediately
with an epoxy filler. The best epoxy
fillers for this purpose are the ones
you make yourself from epoxy resin,
such as the Gougeon Brothers
West System epoxy, and a filler
such as phenolic microballoons or
microspheres. Remember that lead
is pretty soft, and you don’t want
your filler to be significantly harder
than the surrounding material."

I think I'd do what they suggest. It all makes sense to me. IMHO...again.