An alternative thats works! And it's easier too.
Black Flock can be purchased in a powdery form from good craft shops.
Spray the inside of the tube with Spray adhesive, throw the flock substance in, turn the tube around and around, shaking, tapping,
until the total interior surface is covered in flock.
Let let glue totally dry and lightly air blow or lightly vacuum out the loose particles. Hey Presto! Job done!
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