Polishing filigree depends on what type of filigree it is. If it is
scrollwork comprised of smooth wire (usually round, rectangular, or
square), then grinding them with silicon wheels to clean them up,
brush finishing to get in between the wires and then high polishing
with a mini muslin buff on the flex shaft it will work. (I use blue
rouge, but any high polish compound will work for the final finish.)
If it is Russian, Yemeni, or some other style that has twisted and
milled wires in between smoother frame wires, then the traditional
finish is to leave the filler wires unpolished, pickle white and only
high polish the frame wires as described above.
Tumbling filigree and scrollwork won’t make it fall apart, but I’d
rather watch paint dry than push shot out of every tiny space!
Hope this helps,