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There seem to be a whole host of options for blackening tubes - Krylon, flat black paint, blackboard paint, black felt, flocking sheets, mixing flat black paint with something rough, etc, etc.
I used flat black paint for a refractor tube and am very happy with the result (plus some painted fly screen instead of baffle...).
I've also used self adhesive felt for a light shield in a single pole dob I made - bought the felt at Spotlight.
Andrew
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