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well.....
Well toyos, you certainly got two-bob's worth from a couple of us: obviously from your reply you know how to/are confident of your scope's collimation - all the other points made are certainly worth a try: except the one about epoxy paints!
Flat black epoxies certainly have a degree of durability, but not when I require a matt surface: I use them extensively for certain applications; but they are one of the least matt or "flat" blacks around. Krylon flat black has been a favourite for many. I personally would advise using a pure acrylic binder black paint (not the same as "acrylic" paints that are actually PVA's) that you mix a powerfull flattening medium into yourself - you can get this in archival paints at your local fine arts supplier.
This way you can make it as flat as Hades (if Hades is flat!) and be assured of the quality/longevity of the surface as well as its "flatness."
The unknowing confuse "flatness" or the degree of matt in black paints with chroma, the degree of colour intensity or saturation; doubly confusing when one remembers that "black" is essentially "no colour!"
If you mix walnutshells/whatever into the above, you have the extra comfort of knowing these paints/binder bases are expressly formulated to "glue/hold" the brew together.
Pardon the waffle, but this is my profession and especial expertise!!!
Cheers, Darryl.
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