I use a ceramic broadhead sharpener called a " tru angle" " . Before every season and some inbetween I touch up the broadheads that are still in my quiver. Even if you dont shoot these they can slightly dull over time by vibration in the quiver or from pulling them out and sticking them back in. Touch them up and put a light coat of vasoline on them. You' ll save alot of money in the long run by not having to buy so many replacement blades.
Oh, and heres another little tip. When using the tru angle sharpener, take the trokar tip off the muzzy broadhead before you sharpen it.