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Actually , baffling the inside of a newtonian is a good idea , and there is a proper way of doing it. It is a very good way of increasing contrast and stopping stray light (which will fog long exposures).
The method involves a graphical design method from what I remember. If I can locate the link or the article (I think it was in S&T several years ago) I'll post the link or the citation.
Parallax Telescopes does this in their premium newtonians (last I heard).
Your mass manufactured newtonians and dobs don't because it is labor intensive and time consuming fabricating the baffles and installing them == $
Been thinking of doing this on my next newtonian revamp.
As to "flocking paint" , you will be looking at getting the same kind of paint the military uses to make their stuff hard to see at night , it's most likely top secret.
Essentially you need the paint to turn the surface into a near perfect black body (that absorbs all light that falls onto it) and does not reradiate or reflect or scatter any light.
Easiest and cheapest fix is to use a matt black paint that has fine sand mixed with it , or just to get some flocking paper.
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