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Yea, if you can find seat belt webbing that is best webbing, but almost any webbing will hold the paste and the webbing polishes. SRD uses a heavier weave poly webbing.

Or buy a yard of Polyester...

It’s probably not the paste, possibly a missed stroke on the strop and a wiped out edge. You have to remember a pasted strop is very abrasive, if you lift the spine while still moving you will wipe...