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The last time I had my scope apart to clean the mirrors I noticed that around the bottom part of the tube and some sections inside there was rust.(steel tube!)
I also thought of flocking but with the rust problem and future dew moistening the flocking, this would tend to promote further rusting down the track.
With this in mind and needing to fix the rust I searched for a product that would solve both problems - eliminate the rust and sufficiently blacken the tube.
There is a product made by White Knight called Rust Guard Flat Black Epoxy Enamel and you can buy it in a spray can. (no affilliations). This product, following removal of the rust, can be sprayed inside the tube and will leave a very smooth black matt finish and is also self priming. After taking all the bits off the scope, sanding all traces of rust, a couple of coats will leave a good finish that I have found is probably as good as flocking. Might be worth a try.
Cheers
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