First make sure that you remove any trace of clearcoat on your part to polish.
After that it depends how is the condition of your part, do you have deep scratch or it is free of deep scratch.
Always test buffing with softer compound before more agressif compound, you will save lots of time. For exemple try with Tripoli if it is not agressif enough go with emery. By the way Emery is more agressif then tripoli.
hope this will help.
good luck
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