Leon paul wires have been single covering of cotten with no covering of varnish.
We obviously wire up thousands of blades a year a year with out a problem, so the reason for the problem is likely to be technique of unwinding the wire or application. There are good reasons for doing what we do, all wires with varnish have to have the insulating layer removed and you would be surprised at the number of fencers who bring weapons they have mounted with foreign blades to our stand at competitions which don't work because the varnish has not been removed. Removal of the varnsh needs matches/lighter or worse a file/knife blade which introduces fatigue fracture scratches into the wire surface, (it works for a month and then in mid fight falls off with out the fencer knowing.)
My best guess is the wire coating is being disturbed as the wite us being unwound ready for use, the cloth covering should be trapped at the wire plastic cup during production, it is possible that in a batch this has gone wrong. I will ask production to check present stock. In the mean time contact
sales@leonpaul.com and we will send you some replacements. Barry Paul