I'm no "pro", but have changed my polishing technique to avoid black on soft metals entirely.
For steel I use:
black/sisal or black/tight spiral (Depends on the surface)
brown/tight spiral
white/loose cotton
for aluminum:
brown/treated vented buff (firm)
green/tight spiral or medium vented buff
white/ flannel
Of course, I wet sand to a minumum of 400 before the parts ever touch the buffing wheel.
My results have been excellent using these methods with either material.
|