Like Alex, I have used the black velvet adhesive rolls from Bunnings (crafts section, near the art supplies). I have used it on all sorts of scopes, it was applied to the inside tube face of my truss tube newt that i built, as carbon fibre tube is shiny as extruded. Also used it on my truss tube iStar TCR. Used it on the inside of the fixed dew shield of my old Bresser, etc.
Hard to beat $6.50:
https://www.bunnings.com.au/at-home-...-roll_p3970145