Hi Colin,
On the dew shields I've been making for my Maks I've been using the black velvet roll Bunnings sells. Once iin place I take to it with a vacuum cleaner with a brush fitting to suck up whatever loose fibers there might be (and there will be no matter what stuff you use).
Funny thing is the Mak of mine that had the degenerating stuff (i have no idea what this stuff was brand wise) did not benefit from that flocking as the internal baffles were just as good if not better!
That stuff just made a mess like a black Labrador slept in it...
DO NOT use Black 3.0 on any surface that is liable to get wet!!!
It is not designed for use as an external/water resistant paint, particularly on a surface that is going to be man handled or manipulated in any way. Sure, use it on the inside of your SCT, frac or Mak - I have - but it isn't going to get damp or wet there.
It also isn't designed to be flexible, so don't use it in a situation where the paint is liable to be bent or folded. This goes for all paints.
Alex.