Powder Coating-Generic question

[Dave Fain <KC3565L@sprintmail.com>]

I am about to have a metal part (specifically a bicycle frame)
media blasted and powder coated.  I need to fill a small ding
(about 1/8" deep) that cannot be easily removed.  Am I correct
in assuming that bondo would not be suitable for this?  I was
planning to use brass or lead, is one better than the other?
I would prefer lead since I can work it with a regular propane
torch.  Yes, I know....gloves and adequate ventilation, etc.
Thanks, Dave