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I have a bottle of Black 2 - once applied it is very fragile stuff - it doesn’t tolerate being handled or being in contact with anything. It loses its matte surface very easily (light finger touch) or flakes off.
Only practical use on Astro gear is inside a closed OTA like a refractor, mak or SCT.
Forget applying anything over the top - firstly that produces a satin surface and secondly the adhesion to whateve is underneath is still limited by the black paint, ie it will rub or chip off.
If you need a more durable surface consider the various flocking materials, carbide sandpaper, or velvet.
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