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The best matt black you can get is KRYLON available from some retailers but not all. Do a web search to find a supplier near you. Flocking is good, you may be able to get away with a patch on the opposite side to your focuser. When you look through you focuser (without an eyepiece) at the opposite inner side of the tube that is the bit that will be flocked. You can spray the rest of the inside of your tube with the paint.
As Mark said, see if you can look past the end of your tube when you look through the focuser, if you can, this needs an extension to block light from accessing the focuser.
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