The "polishing FAQ" page from Dremel Customer Service might help you get you started: http://www.dremel.com/en-us/CustomerService/faq/bits/Pages/Polishing.aspx
-Beth at Dremel
"When all else fails, read the instructions."Jim
Also, if you have a lapidary ("rockhound") shop or club in your community, contact them for advice
"For almost every problem,there is a DREMEL solution"