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Both work but flocking is simpler and less likely to cause you problems if you don't quite get it right (baffles need to be different diameters along the tube).
However, when you spend the time to flock the tube make sure gaps around the mirror are baffled so the light cannot get in, but still allows air flow, and that the tube extends 1.5x the mirror diameter in front of the focuser (use a light baffle here) so off axis light does not get into your tube and reduce the contrast you are after.
Cheers
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