Most of the molds that I have built for rubber parts, have had a bead blasted surface. This helps with release of the part, and it hides flow lines and imperfections in the part. ALuminum is very hard to polish correctly because material can be removed very quickly with aggressive techniques. Patients is the key to polishing aluminum. Don't be in a hurry to grab that coarse grit, you may be doing more harm than good.
Jim
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