Advice: Retention & Maintenance?

Edge trailing loaded strop
Now we get into the wilderness. There are some commonalities across media, so start there. Similar in some respects to sandpaper in that the abrasive can sink in and produce a more uniform surface. Also has more mobility than sandpaper, so between these two factors, much less likely to create burring. This is where the binder starts to become more important. Binder that swamps the abrasive, becomes impacted with swarf, allows too much mobility etc will reduce the effectiveness of a given abrasive, especially on specific substrates.*
The amount of conformability also effects the ability of the strop to remove burrs, with the advantage going to softer strops due to the changed angle of attack (more up, less across - relatively speaking).

The amount of metal removed is higher for larger grit and harder surfaces, but still very modest. Backhoning on waterstones comes close in terms of material removed.

* side note: anyone that bought/is considering buying a Washboard should not think of the WB compound as just like brand X and only included for convenience. I spent a lot of time making a blend that worked well with paper and at higher spot pressure, even after obtaining good pricing from a quality abrasive manufacturer I went with my house blend. Try other stuff, but make sure to try the WB compound too.
 
Guys,

Massive, massive thanks.

Still digesting it all but wanted to let you know I'm thinking this all through.

Helped to be out in the woods this weekend, although it occurred to me that I probably should have warned one of my buds about the Opinel he borrowed!! Oopsies.
 
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