How To Sharpening a Karambit?

Ceramic rod should work. Sharpening motion and then stropping motion. I personally wouldn’t attempt to sharpen or strop on anything flat with a karambit.
 
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WickedEdge has a half-round stone that works well, even using it freehand.

A ceramic rod works, even if it is angled like the Sharpmaker.

A large dowel -- say 2 inches in diameter -- wrapped in sand paper would be fastest. You could use the rod wrapped in your stropping medium for stropping, too.
 
WickedEdge has a half-round stone that works well, even using it freehand.

A ceramic rod works, even if it is angled like the Sharpmaker.

A large dowel -- say 2 inches in diameter -- wrapped in sand paper would be fastest. You could use the rod wrapped in your stropping medium for stropping, too.
Wonder if 800 grit is OK to start with?
 
If you have one of the guided systems, that uses the Edge Pro form of stones. The Venev Gemini Series Curved Diamond stones, that Gritomatic sells, should work very well.

O.B.
 
This is gonna sound very redneck, but find yourself a piece of broken ceramic plant pot. Or use an intact one, if it’s all you have.

Distant second is some wet/dry sandpaper wrapped around a 10” offcut of 3” PVC pipe. Don’t forget to affix it with duct tape.

Yeehaw!

Parker
 
A 10" or 12" oval cross-section kitchen cutlery 'steeling rod' in diamond works pretty well for setting a new edge or reprofiling a recurved edge. I've used an EZE-Lap 10" rod like the one pictured below, to set more acute geometry on a hawkbill blade. The rod can be used in-hand in conventional 'steeling' fashion, or it can be propped at an angle in Sharpmaker style, or supported flat and used like a bench stone. Lots of ways to use it. As with any plated diamond hone, light-to-moderate pressure works best. The length of the rod and the oval radius in cross-section makes for more abrasive surface contact in each pass, so it can work pretty quickly. Most of these rods seem to be about 600 grit, BTW. That's a good compromise between edge-setting speed and for making a very good or great working edge in itself.
EZ_D10_3070.jpg

After using the diamond for setting the edge at good geometry, then most of the touch-up maintenance can be done on a ceramic rod. In fact, a relatively toothy edge set with diamond and then microbeveled in just 2 or 3 passes per side is a way to make a great, aggressive slicing edge.
 
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