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Finishing
No matter what your casting style is, you'll need to sand the base of your caps to finish them. You can use regular sandpaper or a belt sander if you're making them in larger quantities.
For hand sanding, step up grits to get the finish you like. As an example, you could do:
240 -> 400 -> 800 -> 1000
In this example, 240 is for shaping: getting rid of sprue circles and any flashing. As soon as that's done, stop and move to the next grit for 5-10 seconds, then the next for 5-10 seconds, sanding in a circular motion. Make sure you at least wipe down the caps between grit changes, since you can clog some of the higher grits and it takes longer to sand.
If you have an air compressor, get an air blaster with a tapered nozzle, it makes quick work of any dust. If you don't have an air compressor, you can let your caps soak in cold to room temperature water and scrub gently with a toothbrush. This is far more time consuming between the scrubbing and drying, and you may not get all the dust out easily. But hey, it builds character!
Every once in awhile you might get a bubble in a clear cast. If this is the case, try waiting a minute with slower cure resins and then brush the bubbles that rose to the top off the edge of the mold. If you have a vacuum chamber, definitely use that to pull the majority of the larger bubbles.