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For sanding I just used some sheets of 1200grit sandpaper cut into strips 2-3cm wide and worked at it slowly by hand. It took a couple of hours but it's enjoyable work!
I have had these wheels out a few times and I am quite impressed with the stiffness for such a lightweight set. I suspect the high spoke tension may be part of the reason. The hubs are very smooth and a bit quieter than I suspected.