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It can also affect the bevel because the hook makes a high spot and the area just before the heel won't reach the stone. It is caused by improper honing. It's normally either a straight stroke or not...

I started out with it using a red shop towel and it didn't work to my expectations. I switched to an old cotton sock and it seemed to work much better. Now if I could just get my hands on one of...

Be patient with the 3M. It works but needs a little time. 10 minutes seems like a long time when you're buffing by hand.

...Oh yeah, and use 3M marine on a rag to clean it. That won't remove the etching.

It may be beyond saving with the amount of rust/staining there is. Sanding will permanently damage it for sure. However, you might be able to save and darken it.
Check this thread:...