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What type of strop is it?
Hanging strops are less than ideal for pasting unless you know what you are doing. Or so I was told in the stropping forum.

Paste is almost always used on paddle strops...

I used the red paste on a pasted paddle strop.
I haven't used it in a long time since I also have a coticule of which the grit is supposed to be finer than the red paste.

Actually, I do use the...