I have 2 stones I use for sharpening my knives, both are double-sided combination stones. If the blade needs major repair work or a new angle on the edge I use a silicon carbide oilstone. Then I finish up with a 4000/8000 grit watestone for a fine edge.
As mentioned earlier you'd probably want a 45° edge. Using it as a tool will more than likely destroy any edge you have on there, but compared to a 30° it will last much longer for general usage.
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