I too would like to know why your Tuf-Cloth let you down. We had a 24 hour downpour here yesterday. I took a 1095 carbon blade, wiped it with Marine Tuf-Cloth and let it stay out for several hours. Took it in wet and put it on a stand over night without wiping it down. Not a spot on it the next morning. Absolutely no rust.
Maybe your cloth was dry? I would be interested in hearing what happened.
Regards,
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~Greg Mete~
Kodiak Alaska
JKM-Chai