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to that I would say approach with caution. get too aggressive on one wrap and you'll have to rewrap them all, which would probably be the best way to approach that particular project.

fwiw I sand down each flat to 400 grit (100, 150, 220, 320, 400) using a small glass sanding block and use 0000 steel wool for final smoothing. that said I've never worked on or built an...

there's no reason to round off the corners.
try to preserve the corners of the hex.