Moly knives are too hard. Its basic physics, if the knife is harder than the sharpening stone then it will take forever to sharpen. Carbon knives nowadays are fairly resistant to rusting as long as you wipe your knife clean and take care of it. The best custom knife forgers always stay away from stainless alloys (like moly) because the knives arent great for retaining a true razor edge. I can literally shave myself with my knives which are all carbon based damascus style knives. They require careful attention but are well worth it in the end. Some of these damascus knife makers actually use a touch of nickel in their mixtures to resist the rusting and it still enables you to have the advantages of carbon steel.