Agree with all the above, I've used the stick on ProtoStar stuff, as well as Spotlight's black felt. There always used to be a bit of 'rubbish" that fell from the felt, but a damp cloth after it is installed seemed to remove most or all of that.
Depending on what you are flocking of course, in my 10" newt I cut about a dozen thin annular rings of formica, and glued them into place, plus a selection of part-way round ones across from the focuser. Overkill? Maybe, but the views certainly look good.
Gary
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